NEET PYQs for Mole Concept and Molar Masses with Solutions: Practice NEET Previous Year Questions

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Mole Concept and Molar Masses is an important topic in the Chemistry section in NEET exam. Practising this topic will increase your score overall and make your conceptual grip on NEET exam stronger.

This article gives you a full set of NEET PYQs for Mole Concept and Molar Masses with explanations for effective preparation. Practice of NEET Chemistry PYQs including Mole Concept and Molar Masses questions regularly will improve accuracy, speed, and confidence in the NEET 2026 exam.

NEET PYQs for Mole Concept and Molar Masses with Solutions

1.
The percentage weight of Zn in white vitriol $[ZnSO_4 . 7H_2O]$ is approximately equal to $(at. \, mass\, of \, Zn= 65, S=32, 0=16 \, and \, H= 1)$
- $33.65%$
- $32.56%$
- $23.65%$
- $22.65%$
View Solution
2.
Equal masses of H₂, O₂ and methane have been taken in a container of volume V at temperature 27°C in identical conditions. The ratio of the volumes of gases H₂ : O₂ : methane would be :
- 16 : 8 : 1
- 16: 1 : 2
- 8 : 1 : 2
- 8: 16 : 1
View Solution
3.
Specific volume of cylindrical virus particle is $6.02 \times 10^{-2}$ cc/g, whose radius and length are $7 \mathring{A} \, and \, 10\mathring{A}$ respectively. If $N_A = 6.023 \times 10^{23},$ find molecular weight of virus.
- $15.4 kg/mol$
- $1.54 \times10^4 kg/mol$
- $3.08 \times 10^4 kg/mol $
- $3.08 \times10^3 kg/mol$
View Solution
4.
Suppose the elements $X $ and $Y$ combine to form two compounds $XY_2$ and $X_3Y_2$. When $0.1$ mole of $XY_2$ weighs $10\, g$ and $0.05$ mole of $X_3Y_2$ weighs $9\, g$, the atomic weights of $X$ and $Y$ are
- 40, 30
- 60, 40
- 20, 30
- 30 , 20
View Solution
5.
The number of moles of hydrogen molecules required to produce 20 moles of ammonia through Haber's process is
- 10
- 20
- 30
- 40
View Solution
6.
The percentage of pyridine (C₅H₅N) that forms pyridinium ion (C₅H₅N⁺H) in a 0.10 M aqueous pyridine solution (K_b for C₅H₅N = 1.7×10⁻⁹) is
- 0.00006
- 0.00013
- 0.0077
- 0.016
View Solution
7.
The density of 2 M aqueous solution of NaOH is 1.28 g/cm$^3$. The molality of the solution is [Given that molecular mass of NaOH = 40 g mol$^{-1}$]
- 1.20 m
- 1.56 m
- 1.67 m
- 1.32 m
View Solution
8.
The number of gram molecules of oxygen in $6.02 \times 10^{24}$ CO molecules is
- 10 g molecules
- 5 g molecules
- 1 g molecule
- 0.5 g molecule
View Solution
9.
The number of moles of $KMnO_4$ that will be needed to react with one mole of sulphite ion in acidic solution is
- 44656
- 44597
- 1
- 44625
View Solution
10.
The bond dissociation energies of X₂ , Y₂ and XY are in the ratio of 1 : 0·5 : 1. ΔH for the formation of XY is – 200 kJ mol^–1 . The bond dissociation energy of X₂ will be
- 200 kJ mol^–1
- 800 kJ mol^–1
- 100 kJ mol^–1
- 400 kJ mol^–1
View Solution
11.
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)
- O₂, 0.16 g
- Mg, 0.44 g
- O₂, 0.28 g
- Mg, 0.16 g
View Solution
12.
In which case is the number of molecules of water maximum ?
- 18 mL of water
- 0·00224 L of water vapours at 1 atm and 273 K
- 0·18 g of water
- 10^–3 mol of water
View Solution
13.
The number of moles of oxygen in 1 L of air containing 21% oxygen by volume, under standard conditions, is
- 0.0093 mole
- 2.10 moles
- 0.186 mole
- 0.21 mole
View Solution
14.
When 22.4 litres 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 :
- 2 mol of HCl (g)
- 0 .5 mol of HCl (g)
- 1.5 mol of HCl (g)
- 1 mol of HCl (g)
View Solution

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NEET PYQs for Mole Concept and Molar Masses with Solutions

1.The percentage weight of Zn in white vitriol $[ZnSO_4 . 7H_2O]$ is approximately equal to $(at. \, mass\, of \, Zn= 65, S=32, 0=16 \, and \, H= 1)$

2.Equal masses of H2, O2 and methane have been taken in a container of volume V at temperature 27°C in identical conditions. The ratio of the volumes of gases H2 : O2 : methane would be :

3.Specific volume of cylindrical virus particle is $6.02 \times 10^{-2}$ cc/g, whose radius and length are $7 \mathring{A} \, and \, 10\mathring{A}$ respectively. If $N_A = 6.023 \times 10^{23},$ find molecular weight of virus.

4.Suppose the elements $X $ and $Y$ combine to form two compounds $XY_2$ and $X_3Y_2$. When $0.1$ mole of $XY_2$ weighs $10\, g$ and $0.05$ mole of $X_3Y_2$ weighs $9\, g$, the atomic weights of $X$ and $Y$ are

5.The number of moles of hydrogen molecules required to produce 20 moles of ammonia through Haber's process is

6.The percentage of pyridine (C5H5N) that forms pyridinium ion (C5​H5​N+H) in a 0.10 M aqueous pyridine solution (Kb​ for C5H5N = 1.7×10−9) is

7.The density of 2 M aqueous solution of NaOH is 1.28 g/cm$^3$. The molality of the solution is [Given that molecular mass of NaOH = 40 g mol$^{-1}$]

8.The number of gram molecules of oxygen in $6.02 \times 10^{24}$ CO molecules is

9.The number of moles of $KMnO_4$ that will be needed to react with one mole of sulphite ion in acidic solution is

10.The bond dissociation energies of X2 , Y2 and XY are in the ratio of 1 : 0·5 : 1. ΔH for the formation of XY is – 200 kJ mol–1 . The bond dissociation energy of X2 will be

11.1.0 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)

12.In which case is the number of molecules of water maximum ?

13.The number of moles of oxygen in 1 L of air containing 21% oxygen by volume, under standard conditions, is

14.When 22.4 litres 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 :

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1.
The percentage weight of Zn in white vitriol $[ZnSO_4 . 7H_2O]$ is approximately equal to $(at. \, mass\, of \, Zn= 65, S=32, 0=16 \, and \, H= 1)$

2.
Equal masses of H₂, O₂ and methane have been taken in a container of volume V at temperature 27°C in identical conditions. The ratio of the volumes of gases H₂ : O₂ : methane would be :

3.
Specific volume of cylindrical virus particle is $6.02 \times 10^{-2}$ cc/g, whose radius and length are $7 \mathring{A} \, and \, 10\mathring{A}$ respectively. If $N_A = 6.023 \times 10^{23},$ find molecular weight of virus.

4.
Suppose the elements $X $ and $Y$ combine to form two compounds $XY_2$ and $X_3Y_2$. When $0.1$ mole of $XY_2$ weighs $10\, g$ and $0.05$ mole of $X_3Y_2$ weighs $9\, g$, the atomic weights of $X$ and $Y$ are

5.
The number of moles of hydrogen molecules required to produce 20 moles of ammonia through Haber's process is

6.
The percentage of pyridine (C₅H₅N) that forms pyridinium ion (C₅H₅N⁺H) in a 0.10 M aqueous pyridine solution (K_b for C₅H₅N = 1.7×10⁻⁹) is

7.
The density of 2 M aqueous solution of NaOH is 1.28 g/cm$^3$. The molality of the solution is [Given that molecular mass of NaOH = 40 g mol$^{-1}$]

8.
The number of gram molecules of oxygen in $6.02 \times 10^{24}$ CO molecules is

9.
The number of moles of $KMnO_4$ that will be needed to react with one mole of sulphite ion in acidic solution is

10.
The bond dissociation energies of X₂ , Y₂ and XY are in the ratio of 1 : 0·5 : 1. ΔH for the formation of XY is – 200 kJ mol^–1 . The bond dissociation energy of X₂ will be

11.
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)

12.
In which case is the number of molecules of water maximum ?

13.
The number of moles of oxygen in 1 L of air containing 21% oxygen by volume, under standard conditions, is

14.
When 22.4 litres 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 :