5g of zinc is treated separately with an excess of (a) dilute hydrochloric acid and (b) aqueous sodium hydroxide. The ratio of the volumes of H2 evolved in these two reactions is:

Engineering

Chemistry

Compounds of d Block Elements

Question

5g of zinc is treated separately with an excess of

(a) dilute hydrochloric acid and

(b) aqueous sodium hydroxide.

The ratio of the volumes of H₂ evolved in these two reactions is:

1 :4

2 : 1

1 : 2

1 : 1

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Zn + 2NaOH → Na₂ZnO₂ + H₂

Zn + 2HCl → ZnCl₂ + H₂

According to stoichiometry in both the reactions, equal number of moles of H₂ are evolved.