JEE Main 2026 Apr 6 Shift 2, Chemistry Q1: Mole Concept And Equivalent Concept

JEE Main2026Apr 6, Shift 2Chemistry

Which of the following contain the same number of atoms?

(Given: Molar mass in g mol $^{- 1}$ of H, He, O and S are 1, 4, 16 and 32 respectively)

A. 2 g of O $_{2}$ gas

B. 4 g of SO $_{2}$ gas

C. 1400 mL of O $_{2}$ at STP

D. 0.05 L of He at STP

E. 0.0625 mol of H $_{2}$ gas

Choose the correct answer from the options given below:

Solution

Count atoms in each sample (in units of $N_{A}$ , using $1 mol gas = 22.4$ L at STP).

A. $\frac{2}{32} \times 2 N_{A} = 0.125 N_{A}$ .

B. $\frac{4}{64} \times 3 N_{A} = 0.1875 N_{A}$ .

C. $\frac{1400}{22400} \times 2 N_{A} = 0.125 N_{A}$ .

D. $\frac{0.05}{22.4} \times 1 N_{A} \approx 0.0022 N_{A}$ .

E. $0.0625 \times 2 N_{A} = 0.125 N_{A}$ .

$∴$ A, C and E carry the same number of atoms.

Concept behind this question

Concept-wise practice with instant solutions on Fundamenthol.