Hydrogen can be Prepared from dilute sulphuric acid using zinc but not lead. Give reason

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Solution

Lead is a less active metal than zinc. Lead reacts with dilute sulphuric acid slowly to release hydrogen but the reaction eventually stops. Lead sulphate formed is insoluble and forms a layer on the metal. This barrier does not allow the acid to come in contact with the metal and thus stops the reaction.

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Similar questions

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.

Give reason for the following

1. Nitric acid in the dilute form is not used in the laboratory preparation of hydrogen from metals.

2. Granulated zinc is preferred to metallic zinc in the preparation of hydrogen using dilute acid.

3. Hydrogen and alkali metals of group [1A] react with copper [II] oxide to give copper.

4. Hydrogen is collected by the downward displacement of water and not even though it is lighter than air.

5. A Mixture of hydrogen and chlorine can be separated by passage through a porous pot

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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