JEE Main 2026 Apr 5 Shift 2, Chemistry Q1: Mole Concept And Equivalent Concept

JEE Main2026Apr 5, Shift 2Chemistry

What volume of hydrogen gas at STP would be liberated by action of 50 mL of $H_{2} S O_{4}$ of 50% purity (density $= 1.3$ g mL $^{- 1}$ ) on 20 g of zinc?

Given: Molar mass of H, O, S, Zn are 1, 16, 32, 65 g mol $^{- 1}$ respectively.

A
5.824 L
B
7.428 L
C
6.892 L
D
8.375 L

Solution

Mass of pure $H_{2} S O_{4}$ in the solution: $50 \times 1.3 \times \frac{50}{100} = 32.5$ g, hence moles $= \frac{32.5}{98} \approx 0.332$ mol.

Moles of Zn $= \frac{20}{65} \approx 0.308$ mol. Reaction: $Z n + H_{2} S O_{4} \to Z n S O_{4} + H_{2}$ .

Zn is the limiting reagent (0.308 $<$ 0.332), so moles of $H_{2}$ formed $= 0.308$ mol.

Volume at STP: $0.308 \times 22.7 \approx 6.89$ L.

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JEE Main 2026 Apr 5 Shift 2, Chemistry Q1: Mole Concept And Equivalent Concept

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