Some Basic Concepts of Chemistry · Chemistry · JEE Main

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Numerical

JEE Main 2024 (Online) 1st February Evening Shift
$10 \mathrm{~mL}$ of gaseous hydrocarbon on combustion gives $40 \mathrm{~mL}$ of $\mathrm{CO}_2(\mathrm{~g})$ and $50 \mathrm{~mL}$ of water vapour. ...
JEE Main 2024 (Online) 1st February Morning Shift
Consider the following reaction : $$ 3 \mathrm{PbCl}_2+2\left(\mathrm{NH}_4\right)_3 \mathrm{PO}_4 \rightarrow \mathrm{Pb}_3\left(\mathrm{PO}_4\right)...
JEE Main 2024 (Online) 31st January Evening Shift
The molarity of $$1 \mathrm{~L}$$ orthophosphoric acid $$\left(\mathrm{H}_3 \mathrm{PO}_4\right)$$ having $$70 \%$$ purity by weight (specific gravity...
JEE Main 2024 (Online) 31st January Morning Shift
Number of moles of methane required to produce $$22 \mathrm{~g} \mathrm{~CO}_{2(\mathrm{~g})}$$ after combustion is $$\mathrm{x} \times 10^{-2}$$ mole...
JEE Main 2024 (Online) 31st January Morning Shift
Molar mass of the salt from $$\mathrm{NaBr}, \mathrm{NaNO}_3, \mathrm{KI}$$ and $$\mathrm{CaF}_2$$ which does not evolve coloured vapours on heating w...
JEE Main 2024 (Online) 30th January Morning Shift
The mass of sodium acetate $$\left(\mathrm{CH}_3 \mathrm{COONa}\right)$$ required to prepare $$250 \mathrm{~mL}$$ of $$0.35 \mathrm{~M}$$ aqueous solu...
JEE Main 2024 (Online) 30th January Morning Shift
$$0.05 \mathrm{~cm}$$ thick coating of silver is deposited on a plate of $$0.05 \mathrm{~m}^2$$ area. The number of silver atoms deposited on plate ar...
JEE Main 2024 (Online) 29th January Evening Shift
Molality of 0.8 M H$$_2$$SO$$_4$$ solution (density 1.06 g cm$$^{-3}$$) is ________ $$\times10^{-3}$$ m.
JEE Main 2024 (Online) 29th January Morning Shift
A solution of $$\mathrm{H}_2 \mathrm{SO}_4$$ is $$31.4 \% \mathrm{H}_2 \mathrm{SO}_4$$ by mass and has a density of $$1.25 \mathrm{~g} / \mathrm{mL}$$...
JEE Main 2024 (Online) 27th January Evening Shift
$$9.3 \mathrm{~g}$$ of aniline is subjected to reaction with excess of acetic anhydride to prepare acetanilide. The mass of acetanilide produced if th...
JEE Main 2024 (Online) 27th January Evening Shift
Volume of $$3 \mathrm{M} \mathrm{~NaOH}$$ (formula weight $$40 \mathrm{~g} \mathrm{~mol}^{-1}$$ ) which can be prepared from $$84 \mathrm{~g}$$ of $$\...
JEE Main 2024 (Online) 27th January Morning Shift
Mass of methane required to produce $$22 \mathrm{~g}$$ of $$\mathrm{CO}_2$$ after complete combustion is _______ g. (Given Molar mass in g mol-1 $$\ma...
JEE Main 2023 (Online) 15th April Morning Shift
The volume (in $\mathrm{mL}$) of $0.1 \mathrm{M} ~\mathrm{AgNO}_{3}$ required for complete precipitation of chloride ions present in $20 \mathrm{~mL}$...
JEE Main 2023 (Online) 13th April Evening Shift
$$1 \mathrm{~g}$$ of a carbonate $$\left(\mathrm{M}_{2} \mathrm{CO}_{3}\right)$$ on treatment with excess $$\mathrm{HCl}$$ produces $$0.01 \mathrm{~mo...
JEE Main 2023 (Online) 13th April Morning Shift
An organic compound gives $$0.220 \mathrm{~g}$$ of $$\mathrm{CO}_{2}$$ and $$0.126 \mathrm{~g}$$ of $$\mathrm{H}_{2} \mathrm{O}$$ on complete combusti...
JEE Main 2023 (Online) 13th April Morning Shift
$$20 \mathrm{~mL}$$ of calcium hydroxide was consumed when it was reacted with $$10 \mathrm{~mL}$$ of unknown solution of $$\mathrm{H}_{2} \mathrm{SO}...
JEE Main 2023 (Online) 11th April Evening Shift
The volume of hydrogen liberated at STP by treating $$2.4 \mathrm{~g}$$ of magnesium with excess of hydrochloric acid is _________ $$\times ~10^{-2} \...
JEE Main 2023 (Online) 11th April Morning Shift
A solution of sugar is obtained by mixing $$200 \mathrm{~g}$$ of its $$25 \%$$ solution and $$500 \mathrm{~g}$$ of its $$40 \%$$ solution (both by mas...
JEE Main 2023 (Online) 8th April Morning Shift
$$0.5 \mathrm{~g}$$ of an organic compound $$(\mathrm{X})$$ with $$60 \%$$ carbon will produce __________ $$\times 10^{-1} \mathrm{~g}$$ of $$\mathrm{...
JEE Main 2023 (Online) 6th April Morning Shift
If 5 moles of $$\mathrm{BaCl}_{2}$$ is mixed with 2 moles of $$\mathrm{Na}_{3} \mathrm{PO}_{4}$$, the maximum number of moles of $$\mathrm{Ba}_{3}\lef...
JEE Main 2023 (Online) 1st February Evening Shift
The molality of a $$10 \%(\mathrm{v} / \mathrm{v})$$ solution of di-bromine solution in $$\mathrm{CCl}_{4}$$ (carbon tetrachloride) is '$$x$$'. $$x=$$...
JEE Main 2023 (Online) 1st February Morning Shift
The density of $$3 \mathrm{M}$$ solution of $$\mathrm{NaCl}$$ is $$1.0 \mathrm{~g} \mathrm{~mL}^{-1}$$. Molality of the solution is ____________ $$\ti...
JEE Main 2023 (Online) 31st January Evening Shift
Assume carbon burns according to the following equation : $2 \mathrm{C}_{(\mathrm{s})}+\mathrm{O}_{2(\mathrm{~g})} \rightarrow 2 \mathrm{CO}(\mathrm{...
JEE Main 2023 (Online) 31st January Evening Shift
A sample of a metal oxide has formula $\mathrm{M}_{0.83} \mathrm{O}_{1.00}$. The metal $\mathrm{M}$ can exist in two oxidation states $+2$ and $+3$. I...
JEE Main 2023 (Online) 31st January Morning Shift
Zinc reacts with hydrochloric acid to give hydrogen and zinc chloride. The volume of hydrogen gas produced at STP from the reaction of $$11.5 \mathrm{...
JEE Main 2023 (Online) 31st January Morning Shift
On complete combustion, $$0.492 \mathrm{~g}$$ of an organic compound gave $$0.792 \mathrm{~g}$$ of $$\mathrm{CO}_{2}$$. The % of carbon in the organic...
JEE Main 2023 (Online) 30th January Evening Shift
The strength of 50 volume solution of hydrogen peroxide is ______ $\mathrm{g} / \mathrm{L}$ (Nearest integer). Given: Molar mass of $\mathrm{H}_{2} ...
JEE Main 2023 (Online) 30th January Morning Shift
Some amount of dichloromethane $$\left(\mathrm{CH}_{2} \mathrm{Cl}_{2}\right)$$ is added to $$671.141 \mathrm{~mL}$$ of chloroform $$\left(\mathrm{CHC...
JEE Main 2023 (Online) 29th January Evening Shift
The volume of HCl, containing 73 g L$$^{-1}$$, required to completely neutralise NaOH obtained by reacting 0.69 g of metallic sodium with water, is __...
JEE Main 2023 (Online) 29th January Evening Shift
When 0.01 mol of an organic compound containing 60% carbon was burnt completely, 4.4 g of CO$$_2$$ was produced. The molar mass of compound is _______...
JEE Main 2023 (Online) 25th January Evening Shift
Number of hydrogen atoms per molecule of a hydrocarbon A having 85.8% carbon is __________ (Given : Molar mass of A = 84 g mol$$^{-1}$$)...
JEE Main 2023 (Online) 25th January Morning Shift
In sulphur estimation, 0.471 g of an organic compound gave 1.4439 g of barium sulphate. The percentage of sulphur in the compound is ____________ (Nea...
JEE Main 2023 (Online) 24th January Evening Shift
The number of units, which are used to express concentration of solutions from the following is _________ Mass percent, Mole, Mole fraction, Molarity,...
JEE Main 2023 (Online) 24th January Morning Shift
When $$\mathrm{Fe_{0.93}O}$$ is heated in presence of oxygen, it converts to $$\mathrm{Fe_2O_3}$$. The number of correct statement/s from the followin...
JEE Main 2023 (Online) 24th January Morning Shift
5 g of NaOH was dissolved in deionized water to prepare a 450 mL stock solution. What volume (in mL) of this solution would be required to prepare 500...
JEE Main 2022 (Online) 29th July Evening Shift
A 1.84 mg sample of polyhydric alcoholic compound 'X' of molar mass 92.0 g/mol gave 1.344 mL of $$\mathrm{H}_{2}$$ gas at STP. The number of alcoholic...
JEE Main 2022 (Online) 28th July Evening Shift
2L of 0.2M H2SO4 is reacted with 2L of 0.1M NaOH solution, the molarity of the resulting product Na2SO4 in the solution is _________ millimolar. (Near...
JEE Main 2022 (Online) 28th July Morning Shift
In the given reaction, $$X+Y+3 Z \leftrightarrows X YZ_{3}$$ if one mole of each of $$X$$ and $$Y$$ with $$0.05 \mathrm{~mol}$$ of $$Z$$ gives compoun...
JEE Main 2022 (Online) 28th July Morning Shift
On complete combustion of $$0.492 \mathrm{~g}$$ of an organic compound containing $$\mathrm{C}, \mathrm{H}$$ and $$\mathrm{O}$$, $$0.7938 \mathrm{~g}$...
JEE Main 2022 (Online) 27th July Morning Shift
$$20 \mathrm{~mL}$$ of $$0.02 \,\mathrm{M} \,\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}$$ solution is used for the titration of $$10 \mathrm{~mL}$$...
JEE Main 2022 (Online) 26th July Evening Shift
A $$100 \mathrm{~mL}$$ solution of $$\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{MgBr}$$ on treatment with methanol produces $$2.24 \mathrm{~mL}$$ of a ga...
JEE Main 2022 (Online) 26th July Morning Shift
Chlorophyll extracted from the crushed green leaves was dissolved in water to make $$2 \mathrm{~L}$$ solution of Mg of concentration $$48\, \mathrm{pp...
JEE Main 2022 (Online) 26th July Morning Shift
When 800 mL of 0.5 M nitric acid is heated in a beaker, its volume is reduced to half and 11.5 g of nitric acid is evaporated. The molarity of the rem...
JEE Main 2022 (Online) 25th July Evening Shift
56.0 L of nitrogen gas is mixed with excess hydrogen gas and it is found that 20 L of ammonia gas is produced. The volume of unused nitrogen gas is fo...
JEE Main 2022 (Online) 25th July Evening Shift
A sample of 4.5 mg of an unknown monohydric alcohol, R-OH was added to methylmagnesium iodide. A gas is evolved and is collected and its volume measur...
JEE Main 2022 (Online) 30th June Morning Shift
Blister copper is produced by reaction of copper oxide with copper sulphide. 2Cu2O + Cu2S $$\to$$ 6Cu + SO2 When 2.86 $$\times$$ 103 g of Cu2O and 4.7...
JEE Main 2022 (Online) 28th June Evening Shift
The complete combustion of 0.492 g of an organic compound containing 'C', 'H' and 'O' gives 0.793 g of CO2 and 0.442 g of H2O. The percentage of oxyge...
JEE Main 2022 (Online) 27th June Evening Shift
116 g of a substance upon dissociation reaction, yields 7.5 g of hydrogen, 60 g of oxygen and 48.5 g of carbon. Given that the atomic masses of H, O a...
JEE Main 2022 (Online) 27th June Morning Shift
Two elements A and B which form 0.15 moles of A2B and AB3 type compounds. If both A2B and AB3 weigh equally, then the atomic weight of A is __________...
JEE Main 2022 (Online) 26th June Evening Shift
CNG is an important transportation fuel. When 100 g CNG is mixed with 208 g oxygen in vehicles, it leads to the formation of CO2 and H2O and produces ...
JEE Main 2022 (Online) 26th June Evening Shift
The moles of methane required to produce 81 g of water after complete combustion is _____________ $$\times$$ 10$$-$$2 mol. [nearest integer]...
JEE Main 2022 (Online) 26th June Morning Shift
On complete combustion 0.30 g of an organic compound gave 0.20 g of carbon dioxide and 0.10 g of water. The percentage of carbon in the given organic ...
JEE Main 2022 (Online) 25th June Evening Shift
A protein 'A' contains 0.30% of glycine (molecular weight 75). The minimum molar mass of the protein 'A' is __________ $$\times$$ 103 g mol$$-$$1 [nea...
JEE Main 2022 (Online) 25th June Morning Shift
The number of N atoms in 681 g of C7H5N3O6 is x $$\times$$ 1021. The value of x is (NA = 6.02 $$\times$$ 1023 mol$$-$$1) (Nearest Integer)...
JEE Main 2022 (Online) 25th June Morning Shift
1 L aqueous solution of H2SO4 contains 0.02 m mol H2SO4. 50% of this solution is diluted with deionized water to give 1 L solution (A). In solution (A...
JEE Main 2022 (Online) 25th June Morning Shift
Number of grams of bromine that will completely react with 5.0 g of pent-1-ene is ___________ $$\times$$ 10$$-$$2 g. (Atomic mass of Br = 80 g/mol) [N...
JEE Main 2022 (Online) 24th June Morning Shift
A 0.166 g sample of an organic compound was digested with conc. H2SO4 and then distilled with NaOH. The ammonia gas evolved was passed through 50.0 mL...
JEE Main 2021 (Online) 1st September Evening Shift
The number of atoms in 8g of sodium is x $$\times$$ 1023. The value of x is ____________. (Nearest integer)[Given : NA = 6.02 $$\times$$ 1023 mol$$-$$...
JEE Main 2021 (Online) 1st September Evening Shift
If 80 g of copper sulphate CuSO4 . 5H2O is dissolved in deionised water to make 5L of solution. The concentration of the copper sulphate solution is x...
JEE Main 2021 (Online) 31st August Evening Shift
Sodium oxide reacts with water to produce sodium hydroxide. 20.0 g of sodium oxide is dissolved in 500 mL of water. Neglecting the change in volume, t...
JEE Main 2021 (Online) 31st August Morning Shift
The molarity of the solution prepared by dissolving 6.3 g of oxalic acid (H2C2O4.2H2O) in 250 mL of water in mol L$$-$$1 is x $$\times$$ 10$$-$$2. The...
JEE Main 2021 (Online) 27th August Evening Shift
100 g of propane is completely reacted with 1000 g of oxygen. The mole fraction of carbon dioxide in the resulting mixture is x $$\times$$ 10$$-$$2. T...
JEE Main 2021 (Online) 27th August Morning Shift
In Carius method for estimation of halogens, 0.2 g of an organic compound gave 0.188 g of AgBr. The percentage of bromine in the compound is _________...
JEE Main 2021 (Online) 26th August Evening Shift
100 mL of Na3PO4 solution contains 3.45 g of sodium. The molarity of the solution is _____________ $$\times$$ 10$$-$$2 mol L$$-$$1. (Nearest integer)[...
JEE Main 2021 (Online) 26th August Morning Shift
An aqueous KCl solution of density 1.20 g mL$$-$$1 has a molality of 3.30 mol kg$$-$$1. The molarity of the solution in mol L$$-$$1 is ____________ (N...
JEE Main 2021 (Online) 27th July Evening Shift
2SO2(g) + O2(g) $$\to$$ 2SO3(g)The above reaction is carried out in a vessel starting with partial pressure PSO2 = 250 m bar, PO2 = 750 m bar and PSO3...
JEE Main 2021 (Online) 27th July Morning Shift
The density of NaOH solution is 1.2 g cm$$-$$3. The molality of this solution is _____________ m. (Round off to the Nearest Integer)[Use : Atomic mass...
JEE Main 2021 (Online) 25th July Evening Shift
The number of significant figures in 0.00340 is ____________.
JEE Main 2021 (Online) 25th July Morning Shift
When 10 mL of an aqueous solution of Fe2+ ions was titrated in the presence of dil H2SO4 using diphenylamine indicator, 15 mL of 0.02 M solution of K2...
JEE Main 2021 (Online) 25th July Morning Shift
Consider the complete combustion of butane, the amount of butane utilized to produce 72.0 g of water is ___________ $$\times$$ 10$$-$$1 g. (in nearest...
JEE Main 2021 (Online) 22th July Evening Shift
If the concentration of glucose (C6H12O6) in blood is 0.72 g L$$-$$1, the molarity of glucose in blood is ____________ $$\times$$ 10$$-$$3 M. (Nearest...
JEE Main 2021 (Online) 20th July Evening Shift
4g equimolar mixture of NaOH and Na2CO3 contains x g of NaOH and y g of Na2CO3. The value of x is ____________ g. (Nearest integer)...
JEE Main 2021 (Online) 20th July Morning Shift
250 mL of 0.5 M NaOH was added to 500 mL of 1 M HCl. The number of unreacted HCl molecules in the solution after complete reaction is ___________ $$\t...
JEE Main 2021 (Online) 20th July Morning Shift
An average person needs about 10000 kJ energy per day. The amount of glucose (molar mass = 180.0 g mol$$-$$1) needed to meet this energy requirement i...
JEE Main 2021 (Online) 18th March Evening Shift
10.0 mL of Na2CO3 solution is titrated against 0.2 M HCl solution. The following titre values were obtained in 5 readings :4.8 mL, 4.9 mL, 5.0 mL, 5.0...
JEE Main 2021 (Online) 18th March Morning Shift
__________ grams of 3-Hydroxy propanal (MW = 74) must be dehydrated to produce 7.8 g of acrolein (MW = 56) (C3H4O) if the percentage yield is 64. (Rou...
JEE Main 2021 (Online) 18th March Morning Shift
A reaction of 0.1 mole of Benzylamine with bromomethane gave 23 g of Benzyl trimethyl ammonium bromide. The number of moles of bromomethane consumed i...
JEE Main 2021 (Online) 18th March Morning Shift
Complete combustion of 3g of ethane gives x $$\times$$ 1022 molecules of water. The value of x is __________. (Round off to the Nearest Integer). [Use...
JEE Main 2021 (Online) 17th March Evening Shift
Consider the above reaction. The percentage yield of amide product is __________. (Round off to the Nearest Integer).(Given : Atomic mass : C : 12.0 u...
JEE Main 2021 (Online) 17th March Morning Shift
15 mL of aqueous solution of Fe2+ in acidic medium completely reacted with 20 mL of 0.03 M aqueous Cr2O$$_7^{2 - }$$. The molarity of the Fe2+ solutio...
JEE Main 2021 (Online) 17th March Morning Shift
The mole fraction of a solute in a 100 molal aqueous solution is ___________ $$\times$$ 10$$-$$2. (Round off to the Nearest Integer).[Given : Atomic m...
JEE Main 2021 (Online) 16th March Evening Shift
When 35 mL of 0.15 M lead nitrate solution is mixed with 20 mL of 0.12 M chromic sulphate solution, _________ $$\times$$ 10$$-$$5 moles of lead sulpha...
JEE Main 2021 (Online) 16th March Morning Shift
Complete combustion of 750 g of an organic compound provides 420 g of CO2 and 210 g of H2O. The percentage composition of carbon and hydrogen in organ...
JEE Main 2021 (Online) 16th March Morning Shift
$$2MnO_4^ - + b{C_2}O_4^{2 - } + c{H^ + } \to xM{n^{2 + }} + yC{O_2} + z{H_2}O$$If the above equation is balanced with integer coefficients, the valu...
JEE Main 2021 (Online) 16th March Morning Shift
A 6.50 molal solution of KOH (aq.) has a density of 1.89 g cm$$-$$3. The molarity of the solution is ____________ mol dm$$-$$3. (Round off to the Near...
JEE Main 2021 (Online) 26th February Evening Shift
The NaNO3 weighed out to make 50 mL of an aqueous solution containing 70.0 mg Na+ per mL is _________ g. (Rounded off to the nearest integer)[Given : ...
JEE Main 2021 (Online) 26th February Morning Shift
The number of significant figures in 50000.020 $$\times$$ 10$$-$$3 is _____________.
JEE Main 2021 (Online) 25th February Morning Shift
In basic medium $$Cr{O_4}^{2 - }$$ oxidises $${S_2}{O_3}^{2 - }$$ to form $$S{O_4}^{2 - }$$ and itself changes into $$Cr{(OH)_4}^ - $$. The volume of ...
JEE Main 2021 (Online) 24th February Evening Shift
The formula of a gaseous hydrocarbon which requires 6 times of its own volume of O2 for complete oxidation and produces 4 times its own volume of CO2 ...
JEE Main 2021 (Online) 24th February Evening Shift
1.86 g of aniline completely reacts to form acetanilide. 10% of the product is lost during purification. Amount of acetanilide obtained after purifica...
JEE Main 2021 (Online) 24th February Morning Shift
4.5 g of compound A (MW = 90) was used to make 250 mL of its aqueous solution. The molarity of the solution in M is x $$ \times $$ 10-1. The value of ...
JEE Main 2020 (Online) 4th September Evening Slot
Consider the following equations : 2Fe2+ + H2O2 $$ \to $$ xA + yB (in basic medium) 2MnO4- + 6H+ + 5H2O2 $$ \to $$ x'C + y'D + z'E (in acidic medium...
JEE Main 2020 (Online) 4th September Morning Slot
The mass of ammonia in grams produced when 2.8 kg of dinitrogen quantitatively reacts with 1 kg of dihydrogen is _______.
JEE Main 2020 (Online) 4th September Morning Slot
A 20.0 mL solution containing 0.2 g impure H2O2 reacts completely with 0.316 g of KMnO4 in acid solution. The purity of H2O2 (in %) is _____________ ...
JEE Main 2020 (Online) 3rd September Evening Slot
The volume (in mL) of 0.1 N NaOH required to neutralise 10 mL of 0.1 N phosphinic acid is ___________.
JEE Main 2020 (Online) 3rd September Evening Slot
6.023 $$ \times $$ 1022 molecules are present in 10 g of a substance 'x'. The molarity of a solution containing 5 g of substance 'x' in 2 L solution i...
JEE Main 2020 (Online) 3rd September Morning Slot
The mole fraction of glucose (C6H12O6 ) in an aqueous binary solution is 0.1. The mass percentage of water in it, to the nearest integer, is _______....
JEE Main 2020 (Online) 3rd September Morning Slot
The volume strength of 8.9 M H2O2 solution calculated at 273 K and 1 atm is ______. (R = 0.0821 L atm K-1 mol-1) (rounded off ot the nearest integer)...
JEE Main 2020 (Online) 2nd September Evening Slot
The ratio of the mass percentages of ‘C & H’ and ‘C & O’ of a saturated acyclic organic compound ‘X’ are 4 : 1 and 3 : 4 respectively. Then, t...
JEE Main 2020 (Online) 9th January Evening Slot
10.30 mg of O2 is dissolved into a liter of sea water of density 1.03 g/mL. The concentration of O2 in ppm is__________.
JEE Main 2020 (Online) 9th January Morning Slot
The hardness of a water sample containing 10–3 M MgSO4 expressed as CaCO3 equivalents (in ppm) is ______. (molar mass of MgSO4 is 120.37 g/mol)...
JEE Main 2020 (Online) 9th January Morning Slot
The molarity of HNO3 in a sample which has density 1.4 g/mL and mass percentage of 63% is _____. (Molecular Weight of HNO3 = 63)...
JEE Main 2020 (Online) 8th January Morning Slot
The volume (in mL) of 0.125 M AgNO3 required to quantitatively precipitate chloride ions in 0.3 g of [Co(NH3)6]Cl3 is ________. M[Co(NH3)6Cl3] = 267.4...
JEE Main 2020 (Online) 8th January Morning Slot
Ferrous sulphate heptahydrate is used to fortify foods with iron. The amount (in grams) of the salt required to achieve 10 ppm of iron in 100 kg of wh...
JEE Main 2020 (Online) 7th January Evening Slot
The flocculation value of HCl for arsenic sulphide sol. is 30 m mol L-1 If H2SO4 is used for the flocculatiopn of arsenic sulphide, the amount in gram...

MCQ (Single Correct Answer)

JEE Main 2024 (Online) 31st January Evening Shift
A sample of $$\mathrm{CaCO}_3$$ and $$\mathrm{MgCO}_3$$ weighed $$2.21 \mathrm{~g}$$ is ignited to constant weight of $$1.152 \mathrm{~g}$$. The compo...
JEE Main 2024 (Online) 30th January Evening Shift
If a substance '$$A$$' dissolves in solution of a mixture of '$$B$$' and '$$C$$' with their respective number of moles as $$\mathrm{n}_{\mathrm{A}}, \...
JEE Main 2024 (Online) 27th January Evening Shift
The quantity which changes with temperature is :
JEE Main 2023 (Online) 12th April Morning Shift
A metal chloride contains $$55.0 \%$$ of chlorine by weight . $$100 \mathrm{~mL}$$ vapours of the metal chloride at STP weigh $$0.57 \mathrm{~g}$$. Th...
JEE Main 2023 (Online) 11th April Evening Shift
A solution is prepared by adding $$2 \mathrm{~g}$$ of "$$\mathrm{X}$$" to 1 mole of water. Mass percent of "$$\mathrm{X}$$" in the solution is :...
JEE Main 2023 (Online) 10th April Evening Shift
Given below are two statements: one is labelled as Assertion $$\mathbf{A}$$ and the other is labelled as Reason $$\mathbf{R}$$ Assertion A : $$3.1500 ...
JEE Main 2023 (Online) 10th April Evening Shift
Match List I with List II .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-family...
JEE Main 2023 (Online) 10th April Morning Shift
The number of molecules and moles in 2.8375 litres of O$$_2$$ at STP are respectively
JEE Main 2023 (Online) 8th April Evening Shift
Which of the following have same number of significant figures? A. 0.00253 B. 1.0003 C. 15.0 D. 163 Choose the correct answer from the options given b...
JEE Main 2023 (Online) 6th April Evening Shift
The volume of $$0.02 ~\mathrm{M}$$ aqueous $$\mathrm{HBr}$$ required to neutralize $$10.0 \mathrm{~mL}$$ of $$0.01 ~\mathrm{M}$$ aqueous $$\mathrm{Ba}...
JEE Main 2023 (Online) 31st January Evening Shift
When a hydrocarbon A undergoes complete combustion it requires 11 equivalents of oxygen and produces 4 equivalents of water. What is the molecular for...
JEE Main 2023 (Online) 30th January Evening Shift
$1 \mathrm{~L}, 0.02 \mathrm{M}$ solution of $\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{5} \mathrm{SO}_{4}\right]$ Br is mixed with $1 \mathrm{~L...
JEE Main 2023 (Online) 29th January Evening Shift
When a hydrocarbon A undergoes combustion in the presence of air, it requires 9.5 equivalents of oxygen and produces 3 equivalents of water. What is t...
JEE Main 2023 (Online) 25th January Evening Shift
What is the mass ratio of ethylene glycol ($$\mathrm{C_2H_6O_2}$$, molar mass = 62 g/mol) required for making 500 g of 0.25 molal aqueous solution and...
JEE Main 2023 (Online) 25th January Morning Shift
'25 volume' hydrogen peroxide means
JEE Main 2022 (Online) 29th July Evening Shift
Consider the reaction $$4 \mathrm{HNO}_{3}(1)+3 \mathrm{KCl}(\mathrm{s}) \rightarrow \mathrm{Cl}_{2}(\mathrm{~g})+\mathrm{NOCl}(\mathrm{g})+2 \mathrm{...
JEE Main 2022 (Online) 29th July Evening Shift
$$ \begin{aligned} &\mathrm{C}(\mathrm{s})+\mathrm{O}_{2}(\mathrm{~g}) \rightarrow \mathrm{CO}_{2}(\mathrm{~g})+400 \mathrm{~kJ} \\ &\mathrm{C}(\mathr...
JEE Main 2022 (Online) 29th July Morning Shift
$$ \mathrm{N}_{2(\mathrm{~g})}+3 \mathrm{H}_{2(\mathrm{~g})} \rightleftharpoons 2 \mathrm{NH}_{3(\mathrm{~g})} $$ $$20 \mathrm{~g} \quad ~~~5 \mathrm{...
JEE Main 2022 (Online) 27th July Morning Shift
$$250 \mathrm{~g}$$ solution of $$\mathrm{D}$$-glucose in water contains $$10.8 \%$$ of carbon by weight. The molality of the solution is nearest to (...
JEE Main 2022 (Online) 27th July Morning Shift
In Carius method of estimation of halogen, $$0.45 \mathrm{~g}$$ of an organic compound gave $$0.36 \mathrm{~g}$$ of $$\mathrm{AgBr}$$. Find out the pe...
JEE Main 2022 (Online) 26th July Evening Shift
Hemoglobin contains $$0.34 \%$$ of iron by mass. The number of Fe atoms in $$3.3 \mathrm{~g}$$ of hemoglobin is (Given: Atomic mass of Fe is $$56 \,\m...
JEE Main 2022 (Online) 25th July Morning Shift
$$\mathrm{SO}_{2} \mathrm{Cl}_{2}$$ on reaction with excess of water results into acidic mixture $$\mathrm{SO}_{2} \mathrm{Cl}_{2}+2 \mathrm{H}_{2} \...
JEE Main 2022 (Online) 29th June Evening Shift
Using the rules for significant figures, the correct answer for the expression $${{0.02858 \times 0.112} \over {0.5702}}$$ will be
JEE Main 2022 (Online) 29th June Morning Shift
Production of iron in blast furnace follows the following equation Fe3O4(s) + 4CO(g) $$\to$$ 3Fe(l) + 4CO2(g) when 4.640 kg of Fe3O4 and 2.520 kg of C...
JEE Main 2022 (Online) 28th June Evening Shift
Compound A contains 8.7% Hydrogen, 74% Carbon and 17.3% Nitrogen. The molecular formula of the compound is, Given : Atomic masses of C, H and N are 12...
JEE Main 2022 (Online) 26th June Morning Shift
A commercially sold conc. HCl is 35% HCl by mass. If the density of this commercial acid is 1.46 g/mL, the molarity of this solution is: (Atomic mass ...
JEE Main 2022 (Online) 24th June Evening Shift
120 g of an organic compound that contains only carbon and hydrogen gives 330 g of CO2 and 270 g of water on complete combustion. The percentage of ca...
JEE Main 2022 (Online) 24th June Morning Shift
If a rocket runs on a fuel (C15H30) and liquid oxygen, the weight of oxygen required and CO2 released for every litre of fuel respectively are : (Give...
JEE Main 2021 (Online) 16th March Evening Shift
The exact volumes of 1 M NaOH solution required to neutralise 50 mL of 1 M H3PO3 solution and 100 mL of 2 M H3PO2 solution, respectively, are :...
JEE Main 2021 (Online) 25th February Morning Shift
Complete combustion of 1.80 g of an oxygen containing compound (CxHyOz) gave 2.64 g of CO2 and 1.08 g of H2O. The percentage of oxygen in the organic ...
JEE Main 2020 (Online) 6th September Evening Slot
The average molar mass of chlorine is 35.5 g mol–1. The ratio of 35Cl to 37Cl in naturally occuring chlorine is close to :...
JEE Main 2020 (Online) 6th September Morning Slot
A solution of two components containing n1 moles of the 1st component and n2 moles of the 2nd component is prepared. M1 and M2 are the molecular weigh...
JEE Main 2020 (Online) 3rd September Evening Slot
The strengths of 5.6 volume hydrogen peroxide (of density 1 g/mL) in terms of mass percentage and molarity (M), respectively, are: (Take molar mass of...
JEE Main 2020 (Online) 7th January Evening Slot
The ammonia (NH3) released on quantitative reaction of 0.6 g urea (NH2CONH2) with sodium hydroxide (NaOH) can be neutralized by :...
JEE Main 2020 (Online) 7th January Morning Slot
Amongst the following statements, that which was not proposed by Dalton was :
JEE Main 2019 (Online) 12th April Evening Slot
25 g of an unknown hydrocarbon upon burning produces 88 g of CO2 and 9 g of H2O. This unknown hydrocarbon contains :
JEE Main 2019 (Online) 12th April Evening Slot
Thermal decomposition of a Mn compound (X) at 513 K results in compound Y, MnO2 and gaseous product. MnO2 reacts with NaCl and concentrated H2O4 to gi...
JEE Main 2019 (Online) 12th April Morning Slot
The mole fraction of a solvent in aqueous solution of a solute is 0.8. The molality (in mol kg–1 ) of the aqueous solution is :
JEE Main 2019 (Online) 12th April Morning Slot
5 moles of AB2 weigh 125 × 10–3 kg and 10 moles of A2B2 weigh 300 × 10–3 kg. The molar mass of A (MA) and molar mass of B (MB) in kg mol are: ...
JEE Main 2019 (Online) 10th April Evening Slot
The minimum amount of O2(g) consumed per gram of reactant is for the reaction : (Given atomic mass : Fe = 56, O = 16, Mg = 24, P = 31, C = 12, H = 1) ...
JEE Main 2019 (Online) 10th April Morning Slot
At 300 K and 1 atmospheric pressure, 10 mL of a hydrocarbon required 55 mL of O2 for complete combustion, and 40 mL of CO2 is formed. The formula of t...
JEE Main 2019 (Online) 9th April Evening Slot
What would be the molality of 20% (mass/ mass) aqueous solution of KI? (molar mass of KI = 166 g mol–1)
JEE Main 2019 (Online) 9th April Morning Slot
For a reaction, N2(g) + 3H2(g) $$ \to $$ 2NH3(g) ; identify dihydrogen (H2) as a limiting reagent in the following reaction mixtures....
JEE Main 2019 (Online) 8th April Evening Slot
The percentage composition of carbon by mole in methane is :
JEE Main 2019 (Online) 12th January Evening Slot
8 g of NaOH is dissolved in 18g of H2O. Mole fraction of NaOH in solution and molality (in mol kg–1) of the solution respectively are - ...
JEE Main 2019 (Online) 11th January Evening Slot
25 ml of the given HCl solution requires 30 mL of 0.1 M sodium carbonate solution. What is the volume of this HCl solution required to titrate 30 mL o...
JEE Main 2019 (Online) 11th January Morning Slot
A 10 mg effervescent tablet containing sodium bicarbonate and oxalic acid releases 0.25 ml of CO2 at T = 298.15 K and p = 1 bar. If molar volume of CO...
JEE Main 2019 (Online) 11th January Morning Slot
An organic compound is estimated through Duma's method and was found to evolve 6 moles of CO2. 4 moles of H2O and 1 mole of nitrogen gas. The formula ...
JEE Main 2019 (Online) 10th January Evening Slot
The amount of sugar (C12H22O11) required to prepare 2L of its 0.1 M aqueous solution is :
JEE Main 2019 (Online) 9th January Evening Slot
For the following reaction, in the mass of water produced from 445 g of C57H110O6 is : 2C57H110O6(s) + 163 O2(g) $$ \to $$ 114 CO2(g) + 110 H2O(l)...
JEE Main 2019 (Online) 9th January Morning Slot
A solution of sodium sulphate contains 92 g of Na+ ions per kilogram of water. The molality of Na+ ions in that solution in mol kg$$-$$1 is : ...
JEE Main 2018 (Online) 16th April Morning Slot
An unknown chlorohydrocarbon has 3.55% of chlorine. If each molecule of the hydrocarbon has one chlorine atom only; chlorine atoms present in 1 g of c...
JEE Main 2018 (Offline)
The ratio of mass percent of C and H of an organic compound (CXHYOZ) is 6 : 1. If one molecule of the above compound (CXHYOZ) contains half as much ox...
JEE Main 2018 (Online) 15th April Evening Slot
For per gram of reactant, the maximum quantity of N2 gas is produced in which of the following thermal decomposition reactions ? (Given : Atomic wt. ...
JEE Main 2018 (Online) 15th April Morning Slot
A sample of $$NaCl{O_3}$$ is converted by heat to $$NaCl$$ with a loss of $$0.16$$ $$g$$ of oxygen. The residue is dissolved in water and precipitated...
JEE Main 2017 (Online) 9th April Morning Slot
What quantity (in mL) of a 45% acid solution of a mono-protic strong acid must be mixed with a 20% solution of the same acid to produce 800 mL of a 29...
JEE Main 2017 (Online) 8th April Morning Slot
Excess of NaOH (aq) was added to 100 mL of FeCl3 (aq) resulting into 2.14 g of Fe(OH)3 . The molarity of FeCl3 (aq) is : (Given molar mass of Fe = 56...
JEE Main 2017 (Offline)
1 gram of a carbonate (M2CO3) on treatment with excess HCl produces 0.01186 mole of CO2. The molar mass of M2CO3 in g mol–1 is:...
JEE Main 2017 (Offline)
The most abundant elements by mass in the body of a healthy human adult are: Oxygen (61.4%); Carbon (22.9%), Hydrogen (10.0%); and Nitrogen (2.6%). Th...
JEE Main 2016 (Online) 9th April Morning Slot
The amount of arsenic pentasulphide that can be obtained when 35.5 g arsenic acid istreated with excess H2S in the presence of conc. HCl ( assuming 10...
JEE Main 2016 (Online) 9th April Morning Slot
An organic compound contains C, H and S. The minimum molecular weight of the compound containing 8% sulphur is : (atomic weight of S = 32 amu) ...
JEE Main 2015 (Offline)
The molecular formula of a commercial resin used for exchanging ions in water softening is C8H7SO3Na (Mol. Wt. 206). What would be the maximum uptake ...
JEE Main 2014 (Offline)
The ratio of masses of oxygen and nitrogen in a particular gaseous mixture is 1 : 4. The ratio of number of their molecule is:
JEE Main 2013 (Offline)
A gaseous hydrocarbon gives upon combustion 0.72 g of water and 3.08 g of CO2. The empirical formula of the hydrocarbon is
JEE Main 2013 (Offline)
Experimentally it was found that a metal oxide has formula M0.98O. Metal M, present as M2+ and M3+ in its oxide. Fraction of the metal which exists as...
JEE Main 2013 (Offline)
The molarity of a solution obtained by mixing 750 mL of 0.5 (M) HCl with 250 mL of 2(M) HCl will be:
AIEEE 2012
The density of a solution prepared by dissolving 120 g of urea (mol. Mass = 60 u ) in 1000g of water is 1.15 g/mL. The molarity of this solution is :
AIEEE 2011
A 5.2 molal aqueous solution of methyl alcohol, CH3OH, is supplied. What is the mole fraction of methyl alcohol in the solution ?
AIEEE 2007
The density (in g mL-1) of a 3.60 M sulphuric acid solution that is 29% H2SO4 (molar mass = 98 g mol-1) by mass will be...
AIEEE 2007
In the reaction 2Al(s) + 6HCl(aq) $$\to$$ 2Al3+ (aq) + 6Cl-(aq) + 3H2(g)
AIEEE 2006
How many moles of magnesium phosphate Mg3(PO4)2 will contain 0.25 mole of oxygen atoms?
AIEEE 2006
Density of a 2.05M solution of acetic acid in water is 1.02 g/mL The molality of the solution is
AIEEE 2005
Two solutions of a substance (non electrolyte) are mixed in the following manner. 480 ml of 1.5 M first solution + 520 ml of 1.2 M second solution. Wh...
AIEEE 2005
If we consider that 1/6, in place of 1/12, mass of carbon atom is taken to be the relative atomic mass unit, the mass of one mole of the substance wil...
AIEEE 2004
6.02 $$\times$$ 1020 molecules of urea are present in 100 ml of its solution. The concentration of urea solution is (Avogadro constant, NA = 6.02 $$\t...
AIEEE 2004
To neutralise completely 20 mL of 0.1 M aqueous solution of phosphorous acid (H3PO3), the volume of 0.1 M aqueous KOH solution required is...
AIEEE 2004
The ammonia evolved from the treatment of 0.30 g of an organic compound for the estimation of nitrogen was passed in 100 mL of 0.1 M sulphuric acid. T...
AIEEE 2003
What volume of hydrogen gas at 273 K and 1 atm pressure will be consumed in obtaining 21.6 g of elemental boron (atomic mass = 10.8) from the reductio...
AIEEE 2003
25 ml of a solution of barium hydroxide on titration with a 0.1 molar solution of hydrochloric acid gave a litre value of 35 ml. The molarity of bariu...
AIEEE 2002
With increase of temperature, which of these changes?
AIEEE 2002
In a compound C, H and N atoms are present in 9 : 1 : 3.5 by weight . Molecular weight of the compound is 108 g mol-1 . Molecular formula of compound ...
AIEEE 2002
Number of atoms in 558.5 gram Fe (at. wt. of Fe = 55.85 g mol-1) is
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