Hydrogen is obtained by displacement from :

(a) dilute sulphuric acid

(b) dilute hydrochloric acid

Write equations using zinc and Iron.

Why does copper not show similar behaviour ?

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Solution

(a) Zinc and iron lie above hydrogen in reactivity series and can displace hydrogen from acid.

Zn + H₂SO₄ → ZnSO₄ + H₂ ↑
(dilute)

Fe + H₂SO₄ → FeSO₄ + H₂ ↑
(dilute)

(b) Zn + 2HCl → ZnCl₂ + H₂ ↑
(dilute)

Fe + 2HCl → FeCl₂ + H₂ ↑
(dilute)

Copper lies below hydrogen. Thus, it cannot displace hydrogen from acids.

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Similar questions

Write word equations and then balanced equations for the reaction taking

place when −

(a) dilute sulphuric acid reacts with zinc granules.

(b) dilute hydrochloric acid reacts with magnesium ribbon.

(d) dilute hydrochloric acid reacts with iron filings.

Zinc liberates hydrogen gas when reacted with dilute hydrochloric acid, whereas copper does not. Why?

Give reason for the following :

(a) Though lead is above hydrogen in the activity series, it does not react with dilute hydrochloric acid or dilute sulphuric acid.

(b) Potassium and sodium are not used fro reaction with dilute hydrochloric acid or dilute sulphuric acid in laboratory preparation of hydrogen.

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