Question

What happens when Zn granules are treated with H2SO4 nitric acid NaOH HCl sodium chloride

Answer 1

(i) With dilute H2SO4 : H2 gas is evolved.

Zn + H2SO4 → ZnSO4 +H2 ↑

(ii) With dilute HCI : H2 gas is evolved.

Zn + HCl → ZnCl2 + H2 ↑

(iii) With dilute HNO3 : H2 gas is evolved.

Zn + 2HNO3 → Zn(NO3)2 + H2 ↑

(iv) With dilute NaCI :

No chemical reaction takes place, because Zn is less reactive than Na.

(v) With dilute NaOH :

Sodium zincate is formed and H2 gas is evolved. Zn + 2NaOH → Na2ZnO2 +H2 ↑

Sodium zincate