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Volume of hydrogen at STP from a metal and an acid

This type of question, asked 6 times: 31 Jan 2023, 11 Apr 2023, 3 Apr 2025, 21 Jan 2026 S1, 22 Jan 2026 S1, 5 Apr 2026 S2. All 6 questions below, oldest first.

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  1. Question 1

    31 Jan 2023

    55
    Zinc reacts with hydrochloric acid to give hydrogen and zinc chloride. The volume of hydrogen gas produced at STP from the reaction of 11.5 g11.5\text{ }g of zinc with excess HClHCl is LL (Nearest integer)
     (Given : Molar mass of Zn is 65.4 g mol−1 and Molar volume of H2 at STP=22.7 L )\text{~(Given : Molar mass of~}Zn\text{~is~}65.4\text{ }g{\text{ }mol}^{- 1}\text{~and Molar volume of~}H_{2}\text{~at~}STP = 22.7\text{ }L\text{~)}

  2. Question 2

    11 Apr 2023

    149
    The volume of hydrogen liberated at STP by treating 2.4 g2.4\text{ }g of magnesium with excess of hydrochloric acid is___ ×10−2 L\times10^{- 2}\text{ }L. Given: Molar volume of gas is 22.4 L22.4\text{ }L at STP. Molar mass of magnesium is 24 g mol−124\text{ }g{\text{ }mol}^{- 1}.

  3. Question 3

    3 Apr 2025

    112
    Mass of magnesium required to produce 220 mL of hydrogen gas at STP on reaction with excess of dil. HCl is Given : Molar mass of Mg is 24 g mol−124\text{ }g{\text{ }mol}^{- 1}.

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  4. Question 4

    21 Jan 2026 S1

    32
    14.0 g of calcium metal is allowed to react with excess HCl at 1.0 atm pressure and 273 K . Which of the following statements is incorrect? [Given : Molar mass in gmol−1gmol^{- 1} of Ca−40,Cl−35.5,H−1Ca - 40,Cl - 35.5,H - 1 ]

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  5. Question 5

    22 Jan 2026 S1

    31
    In the reaction, 2Al(s)+6HCl(aq)→2Al3+(aq)+6Cl−(aq)+3H2(g)2Al(s) + 6HCl(aq) \rightarrow 2Al^{3 +}(aq) + 6Cl^{-}(aq) + 3H_{2}(g), which of the following statements is correct?

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  6. Question 6

    5 Apr 2026 S2

    26
    What volume of hydrogen gas at STP would be liberated by action of 50 mL of H2SO4H_{2}SO_{4} of 50%50\% purity (density =1.3 g mL−1= 1.3\text{ }g{\text{ }mL}^{- 1} ) on 20 g of zinc? Given : Molar mass of H, O, S, Zn are 1, 16, 32, 65 gmol−1gmol^{- 1} respectively.

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