Question

When the same amount of zinc is treated separately with excess of H₂SO₄ and excess of NaOH the ratio of volumes of H₂ evolved is

(a) 1 : 1

(b) 1 : 2

(c) 2 : 1

(d) 9 : 4

Answer 1

Correct option is (a) 1 : 1

Zn + H₂SO₄ → ZnSO₄ + H₂

Zn + 2NaOH → Na₂ZnO₂ + H₂

1 mole atom of zinc produces the same amount of H₂(2g) in each case.