Some Basic Concepts of Chemistry · Chemistry · NEET

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MCQ (Single Correct Answer)

NEET 2024
1 gram of sodium hydroxide was treated with $$25 \mathrm{~mL}$$ of $$0.75 \mathrm{~M} \mathrm{~HCl}$$ solution, the mass of sodium hydroxide left unre...
NEET 2024
The highest number of helium atoms is in
NEET 2024
A compound X contains $$32 \%$$ of A, $$20 \%$$ of B and remaining percentage of C. Then, the empirical formula of $$\mathrm{X}$$ is : (Given atomic m...
NEET 2023 Manipur
The density of 1 M solution of a compound 'X' is 1.25 g mL$$^{-1}$$. The correct option for the molality of solution is (Molar mass of compound X = 85...
NEET 2023
The right option for the mass of $$\mathrm{CO}_{2}$$ produced by heating $$20 \mathrm{~g}$$ of $$20 \%$$ pure limestone is (Atomic mass of $$\mathrm{C...
NEET 2022 Phase 2
The density of the solution is 2.15 g mL$$-$$1, then mass of 2.5 mL solution in correct significant figures is :
NEET 2022 Phase 2
What fraction of Fe exists as Fe(III) in Fe0.96O ? (Consider Fe0.96O to be made up of Fe(II) and Fe(III) only)
NEET 2022 Phase 1
In one molal solution that contains 0.5 mole of a solute, there is
NEET 2022 Phase 1
What mass of 95% pure CaCO3 will be required to neutralise 50 mL of 0.5 M HCl solution according to the following reaction? CaCO3(s) + 2HCl(aq) $$\to$...
NEET 2021
An organic compound contains 78% (by wt.) carbon and remaining percentage of hydrogen. The right option for the empirical formula of this compound is ...
NEET 2020 Phase 1
Which one of the following has maximum number of atoms?
NEET 2020 Phase 1
The number of protons, neutrons and electrons in 17571Lu, respectively, are :
NEET 2019
The number of moles of hydrogen molecules required to produce 20 moles of ammonia through Haber’s process is :
NEET 2018
A mixture of 2.3 g formic acid and 4.5 g oxalic acid is treated with conc. H2SO4 . The evolved gaseous mixture is passed through KOH pellets. Weight (...
NEET 2018
In which case is number of molecules of water maximum?
NEET 2017
Which of the following is dependent on temperature?
NEET 2016 Phase 2
Suppose the elements X and Y combine to form two compounds XY2 and X3Y2. When 0.1 mole of XY2 weights 10 g and 0.05 mole of X3Y2 weighs 9 g, the atomi...
AIPMT 2015
What is the mass of the precipitate formed when 50 mL of 16.9% solution of AgNO3 is mixed with 50 mL of 5.8% NaCl solution ? (Ag = 107.8, N = 14, O =...
AIPMT 2015
If Avogadro number NA, is changed from 6.022 $$ \times $$ 1023 mol$$-$$1 to 6.022 $$ \times $$ 1020 mol$$-$$1, this would change...
AIPMT 2015
The number of water molecules is maximum in
AIPMT 2015
What is the mole fraction of the solute in a 1.00 m aqueous solution?
AIPMT 2015 Cancelled Paper
A mixture of gases contains H2 and O2 gases in the ratio of 1 : 4 (w/w). What is the molar ratio of the two gases in the mixture ? ...
AIPMT 2014
When 22.4 liters of H2(g) is mixed with 11.2 litres of Cl2(g), each at S.T.P. the moles of HCl(g) formed is equal to ...
AIPMT 2014
Equal masses of H2, O2 and methane have been taken in a container of volume V at temperature 27oC in identical conditions. The ratio of the volumes of...
AIPMT 2014
1.0 g of magnesium is burnt with 0.56 g O2 in a closed vessel, Which reactant is left in excess and how much ? (At. wt. Mg = 24, O = 16)
NEET 2013 (Karnataka)
In an experiment it showed that 10 mL of 0.05 M solution of chloride required 10 mL of 0.1 M solution of AgNO3, which of the following will be the for...
NEET 2013
6.02 $$ \times $$ 1020 molecules of urea present in 100 mL of its solution. The concentration of solution is
NEET 2013
How many grams of concentrated nitric acid solution should be used to prepare 250 mL of 2.0 M HNO3? The concentrated acid is 70% HNO3....
AIPMT 2011 Mains
Which has the maximum number of molecules among the following ?
AIPMT 2010 Prelims
The number of atoms in 0.1 mol of a triatomic gas is (NA = 6.02 $$ \times $$ 1023 mol$$-$$1)
AIPMT 2010 Prelims
25.3 g of sodium carbonate, Na2CO3 is dissolved in enough water to make 250 mL of solution. If sodium carbonate dissociates completely, molar concentr...
AIPMT 2009
10 g of hydrogen and 64 g of oxygen were filled in a steel vessel and exploded. Amount of water produced in this reaction will be
AIPMT 2008
How many moles of lead (II) chloride will be formed from a reaction between 6.5 g of PbO and 3.2 g HCl ?
AIPMT 2008
An organic compound contains carbon, hydrogen and oxygen. Its elemental analysis gave C, 38.71% and H, 9.67%. The empirical formula of the compound wo...
AIPMT 2008
What volume of oxygen gas (O2) measuread at 0oC and 1 atm, is needed to burn completely 1 L of propane gas (C3H8) measured under the same conditions ...
AIPMT 2007
An element, X has the following isotopic composition: 200X : 90%  199X : 8.0%  202X : 2.0% The weighted average atomic mass of th...
AIPMT 2007
Concentrated aqueous sulphuric acid is 98% H2SO4 by mass and has a density of 1.80 g mL$$-$$1. Volume of acid required to make one litre of 0.1 M H2SO...
AIPMT 2005
The mole fraction of the solute in one molal aqueous solution is
AIPMT 2004
The maximum number of molecules is present in
AIPMT 2002
Which has maximum molecules?
AIPMT 2002
The percentage of C, H and N in an organic compound are 40%, 13.3% and 46.7% respectively then empirical formula is
AIPMT 2002
2.5 litre of 1 M NaOH solution is mixed with another 3 litre of 0.5 M NaOH solution. Then find out molarity of resultant solution.
AIPMT 2001
Molarity of liquid HCl, if density of solution is 1.17 g/ce is
AIPMT 2001
Percentage of Se in peroxidase anhydrous enzyme is 0.5% by weight (at. wt. = 78.4) then minimum molecular weight of peroxide anhydrous enzyme is
AIPMT 2001
Specific volume of cylinfrical virus particle is 6.02 $$ \times $$ 10$$-$$2 cc/g whose radius and length are 7 $$\mathop A\limits^ \circ $$ and 10 $$...
AIPMT 2000
Volume of CO2 obtained by the complete decomposition of 9.85 g of BaCO3 is
AIPMT 2000
Oxidation numbers of A, B, C are + 2, +5 and $$-$$2 respectively. Possible formula of compound is
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