Multiple choice

The same amount of Zinc is treated separately with excess of sulphuric acid and excess of sodium hydroxide. What will be the ratio of volumes of hydrogen evolved ?

  1. 1:1

  2. 1:4

  3. 2:1

  4. 9:4
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A Correct answer
Explanation

Zinc reacts with H2SO4 to produce ZnSO4 + H2, and with NaOH to produce Na2ZnO2 + H2. In both reactions, 1 mole of Zn produces 1 mole of H2 gas. Therefore, the ratio of volumes of hydrogen evolved is 1:1.

AI explanation

The reaction of zinc with sulfuric acid produces zinc sulfate and hydrogen gas, while the reaction of zinc with sodium hydroxide produces sodium zincate and hydrogen gas. In both reactions, one mole of zinc releases exactly one mole of hydrogen gas. Because the same amount of zinc is treated separately with the two reagents, the ratio of the volumes of hydrogen evolved is 1:1.

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