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Some Basic Concepts of Chemistry

Chemistry

Previous Years Questions

Numerical

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5.00 mL of 0.10 M oxalic acid solution taken in a conical flask is titrated against NaOH from a burette using phenolphth...
JEE Advanced 2020 Paper 1 Offline
In the chemical reaction between stoichiometric quantities of KMnO4 and KI in weakly basic solution, what is the number ...
JEE Advanced 2020 Paper 2 Offline
The amount of water produced (in g) in the oxidation of 1 mole of rhombic sulphur by conc. HNO3 to a compound with the h...
JEE Advanced 2019 Paper 2 Offline
The mole fraction of urea in an aqueous urea solution containing 900 g of water is 0.05. If the density of the solution ...
JEE Advanced 2019 Paper 2 Offline
To measure the quantity of $$MnC{l_2}$$ dissolved in an aqueous solution, it was completely converted to $$KMn{O_4}$$ u...
JEE Advanced 2018 Paper 2 Offline
If the value of Avogadro number is 6.023 $$\times$$ 1023 mol-1 and the value of Boltzmann constant is 1.380 $$\times$$ 1...
JEE Advanced 2014 Paper 1 Offline
29.2 % (w/w) HCl stock solution has density of 1.25 g mL -1 . The molecular weight of HCl is 36.5 g mol -1 . The volume ...
IIT-JEE 2012 Paper 1 Offline
A student performs a titration with different burettes and finds titre values of 25.2 mL, 25.25 mL, and 25.0 mL. The num...
IIT-JEE 2010 Paper 1 Offline
Silver (atomic weight = 108 g mol-1) has a density of 10.5 g.cm-3. The number of silver atoms on a surface of area 10-12...
IIT-JEE 2010 Paper 2 Offline
2.68 $$\times$$ 10-3 moles of a solution containing an ion An+ require 1.61 $$\times$$ 10-3 moles of $$MnO_4^-$$ for the...
IIT-JEE 1984

MCQ (Single Correct Answer)

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Dissolving 120 g of urea (mol. wt. 60) in 1000 g of water gave a solution of density 1.15 g/mL. The molarity of the solu...
IIT-JEE 2011 Paper 1 Offline
Consider a titration of potassium dichromate solution with acidified Mohr’s salt solution using diphenylamine as indicat...
IIT-JEE 2007
The pair of compounds having metals in their highest oxidation state is
IIT-JEE 2004 Screening
Mixture X = 0.02 mol of [Co(NH3)5SO4]Br and 0.02 mol of [Co(NH3)5Br]SO4 was prepared in 2 litre of solution. 1 litre of ...
IIT-JEE 2003 Screening
Which has maximum number of atoms?
IIT-JEE 2003 Screening
How many moles of electron weigh one kilogram?
IIT-JEE 2002 Screening
In the standardization of Na2S2O3 using K2Cr2O7 by iodometry, the equivalent weight of K2Cr2O7 is: ...
IIT-JEE 2001 Screening
An aqueous solution of 6.3 g oxalic acid dehydrate is made up to 250ml. the volume of 0.1N NaOH required to completely n...
IIT-JEE 2001 Screening
The reaction, $$3Cl{O^ - }(aq)$$$$ \to ClO_3^ - (aq) + 2C{l^ - }(aq)$$ is an example of :
IIT-JEE 2001 Screening
Amongst the following identify the species with an atom in +6 oxidation state
IIT-JEE 2000 Screening
The oxidation number of sulphur in S8,S2F2,H2S respectively, are
IIT-JEE 1999
The normality of 0.3 M phosphorus acid (H3PO3) is
IIT-JEE 1999
For the redox reaction: $$MnO_4^ - + {C_2}O_4^{ - 2} + {H^ + }$$ $$ \to M{n^{2 + }} + C{O_2} + {H_2}O$$ The correct coe...
IIT-JEE 1992
Read the following statement and explanation and answer as per the options given below: STATEMENT (S): In the titration ...
IIT-JEE 1991
The oxidation state of the most electronegative element in the products of the reaction. BaO2 with dil. H2SO4 are...
IIT-JEE 1991
The oxidation number of phosphorus in Ba(H2PO2) is :
IIT-JEE 1990
In which mode of expression, the concentration of a solution remains independent of temperature?
IIT-JEE 1988
The equivalent weight of MnSO4 is half of its molecular weight, when it converts to
IIT-JEE 1988
The brown ring complex compound is formulated as [Fe(H2O)5(NO)+]SO4. The oxidation state of iron is...
IIT-JEE 1987
A molal solution is one that contains one mole of solute in
IIT-JEE 1986
The oxidation number of carbon in CH2O is
IIT-JEE 1982
1 mole of N2H4 loses 10 moles of electrons to form a new compound Y. assuming that all nitrogen appears in the new compo...
IIT-JEE 1981
If 0.50 mol of BaCl2 is mixed with 0.20 mol of Na3PO4, the maximum amount of Ba3(PO4)2 that can be formed is ...
IIT-JEE 1981
M is molecular weight of KMnO4. The equivalent wight of KMnO4 when it is converted into K2MnO4 is...
IIT-JEE 1980
The total number of electrons is one molecule of carbon dioxide is
IIT-JEE 1979
A gaseous mixture contains oxygen and nitrogen in the ratio of 1 : 4 by weight. Therefore the ratio of their no of molec...
IIT-JEE 1979
2.76 g of silver carbonate on being strongly heated yields a residue weighing
IIT-JEE 1979
The largest number of molecules is in
IIT-JEE 1979
A compound was found to contain nitrogen and oxygen in the ratio 28 gm and 80 gm respectively. The formula of compound i...
IIT-JEE 1978
27 g of Al will react completely with how many grams if oxygen?
IIT-JEE 1978

Subjective

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Calculate the molarity of water if it's density is 1000 kg/m3
IIT-JEE 2003
Hydrogen peroxide solution (20 ml) reacts quantitatively with a solution of KMnO4 solution is just decolourised by 10 ml...
IIT-JEE 2001
A plant virus is found to consist of uniform cylindrical particles of 150 Å in diameter and 5000 Å long. The specific vo...
IIT-JEE 1999
How many millilitres of 0.5 M H2SO4 are needed to dissolve 0.5 g of copper(II) carbonate?
IIT-JEE 1999
An aqueous solution containing 0.10 g KIO3 (formula weight = 214.0) was treated with an excess of KI solution. The solut...
IIT-JEE 1998
A 3.00 g sample containing Fe3O4, Fe2O3 and an inert impure substance is treated with excess of KI solution in presence ...
IIT-JEE 1996
8.0575 $$\times$$ 10-2 kg of Glauber's salt is dissolved in water to obtain 1 dm3 of a solution of density 1077.2 kg.m-3...
IIT-JEE 1994
The composition of a sample of Wustite is Fe0.93O1.00 what percentage of the iron is present in the form of Fe(III)?...
IIT-JEE 1994
Upon mixing 45.0 ml. of 0.25 M lead nitrate solution with 25.0 ml. of 0.10M chromic sulphate solution, precipitation of ...
IIT-JEE 1993
One gram of commercial AgNO3 is dissolved in 50 ml. of water. It is treated with 50 ml. of a KI solution. The silver iod...
IIT-JEE 1992
A 2.0 g sample of a mixture containing sodium carbonate, sodium bicarbonate and sodium suplphate is gently heated till t...
IIT-JEE 1992
A solution of 0.2 g of a compound containing Cu2+ and $$C_2O_4^{2-}$$ ions on titration with 0.02M $$KMnO_4$$ in presenc...
IIT-JEE 1991
A 1.0 g sample of Fe2O3 solid of 55.2% purity is dissolved in acid and reduced by heating the solution with zinc dust. T...
IIT-JEE 1991
Calculate the molality of 1 litre solution of 93% H2SO4 (weight/volume). The density of the solution is 1.84 g/ml...
IIT-JEE 1990
A solid mixture (5.0 g) consisting of lead nitrate and sodium nitrate was headed below 600oC until the weight of the res...
IIT-JEE 1990
A mixture of H2C2O4 (oxalic acid) and NaHC2O4 weighing 2.02 g was dissolved in water and solution made upto one litre. T...
IIT-JEE 1990
An equal volume of a reducing agent is titrated separately with 1M KMnO4 in acid neutral and alkaline media. The volume...
IIT-JEE 1989
A sample of hydrazine sulphate (N2H6SO4) was dissolved in 100 ml. of water, 10 ml of this solution was reacted with exce...
IIT-JEE 1988
A sugar syrup of weight 214.2 g contains 34.2 g of sugar (C12H22O11). Calculate (i) molal concentration and (ii) mole fr...
IIT-JEE 1988
(i) What is the weight of sodium bromate and molarity pf solution necessary to prepare 85.5 ml of 0.672 B solution when ...
IIT-JEE 1987
Arrange the following in increasing oxidation number of iodine. I2, HI, HIO4, ICl
IIT-JEE 1986
Complete and balance the following equation: $$ClO_3^-$$ + I- + H2SO4 $$\to$$ Cl- + $$HSO_4^-$$...
IIT-JEE 1986
Complete and balance the following equation: Mn2+ + PbO2 $$\to$$ $$MnO_4^-$$ + H2O ...
IIT-JEE 1986
Complete and balance the following equation: Ag+ + AsH3 $$\to$$ H3AsO3 + H+ ...
IIT-JEE 1986
Complete and balance the following equation: S + OH- $$\to$$ S2- + $$S_2O_3^-$$
IIT-JEE 1986
Five ml of 8N nitric acid, 4.8ml of 5N hydrochloric acid and a certain volume of 17M sulphuric acid are mixed together a...
IIT-JEE 1985
Complete and balance the following equations: Cl2 + OH- $$\to$$ Cl- + ClO- ...
IIT-JEE 1983
Complete and balance the following equation: HNO3 + HCl $$\to$$ NO + Cl2
IIT-JEE 1983
Complete and balance the following equation: Zn + $$NO_3^- \to$$ Zn2+ + $$NH_4^+$$
IIT-JEE 1983
4.08 g of a mixture of BaO and an unknown carbonate MCO3 was heated strongly. The residue weighed 3.64 g. This was disso...
IIT-JEE 1983
Complete and balance the following equation: $$Cr_2O_7^{2-}$$ + C2H4O $$\to$$ C2H4O2 + Cr3+...
IIT-JEE 1983
Complete and balance the following equation: Ce3+ + $$S_2O_8^{-2} \to $$ $$SO_4^{-2}$$ + Ce4+...
IIT-JEE 1983
The density of a 3 M Sodium thiosulphate solution (Na2S2O3) is 1.25 g per ml. Calculate (i) the percentage by weight of ...
IIT-JEE 1983
Hydroxylamine reduces iron (III) according to the equation: 2NH2OH + 4Fe3+ $$\to$$ N2O(g) $$ \uparrow $$ + H2O + 4Fe2+ ...
IIT-JEE 1982
A 1.00 gm sample of H2O2 solution containing X percent H2O2 by weight requires X ml of a KMnO4 solution for complete ox...
IIT-JEE 1981
Balance the following Equations: (i) Cu2O + H+ + $$NO_3^ - \to $$ Cu2+ + NO + H2O (ii) K4[Fe(CN)6] + H2SO4 + H2O $$\to$...
IIT-JEE 1981
A compound contains 28 percent of nitrogen and 72 percent of metal by weight. 3 atoms of metal combine with 2 atoms of N...
IIT-JEE 1980
(i). A sample of MnSO4.4H2O is strongly heated in air. The residue is Mn3O4. (ii). The residue is dissolved in 100 ml of...
IIT-JEE 1980
(a) One litre of a sample of hard water contains 1 mg of CaCl2 and 1 mg of MgCl2. Find the total hardness in terms of pa...
IIT-JEE 1980
A mixture contains NaCl and unknown chloride MCl. (i) 1g of this is dissolved in water. Excess of acidified AgNO3 soluti...
IIT-JEE 1980
Find (i) The total number of neutrons and (ii) The total mass of neutron in 7 mg of 14C (Assume that mass of neutron = ...
IIT-JEE 1980
A hydrocarbon contains 10.5 g of carbon per gram of hydrogen. 1 litre of the hydrocarbon at 127oC and 1 atmosphere weigh...
IIT-JEE 1980
In the analysis of 0.5 g sample feldspar, a mixture of chlorides of sodium and potassium is obtained which weighs 0.1180...
IIT-JEE 1979
5 ml of a gas containing only carbon and hydrogen were mixed with an excess of oxygen (30 ml) and the mixture exploded b...
IIT-JEE 1979
(a). 5.5 g of a mixture FeSO4.7H2O and Fe2(SO4)3.9H2O requires 5.4 ml of 0.1 N KMnO4 solution for complete oxidation. Ca...
IIT-JEE 1979
4.215 g of a metallic carbonate was heated in a hard glass tube and the CO2 evolved was found to measure 1336 ml at 27oC...
IIT-JEE 1979
Naturally occurring boron consists of two isotopes whose atomic weighs are 10.01 and 11.01. The atomic weight of natural...
IIT-JEE 1978
Igniting MnO2 converts it quantitatively to Mn3O4. A sample of pyrolusite is of the following composition : MnO2 80%, Si...
IIT-JEE 1978
One gram of an alloy of aluminium and magnetism when treated with excess of dil. HCl forms magnesium chloride, aluminiu...
IIT-JEE 1978
What weight of AgCl will be precipitated when a solution containing 4.77 g of NaCl is added to a solution of 5.77g of Ag...
IIT-JEE 1978

Fill in the Blanks

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The compound YBa2Cu3O7, which shows superconductivity, has copper in oxidation state ______ assume that the rare earth ...
IIT-JEE 1994
The weight of $$1 \times 10^{22}$$ molecules of CuSO4.5H2O is ____.
IIT-JEE 1991
3 g of a salt of molecular weight 30 is dissolved in 250 g of water. The molality if the solution is _____.
IIT-JEE 1983
The total no of electron present in 18 ml of water is ______.
IIT-JEE 1980
The modern atomic unit is based on the mass of ______.
IIT-JEE 1980

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