Though aluminum is above zinc in the activity series, it requires a higher temperature to react with water, why ?

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Solution

Aluminium metal rapidly develops a thin layer of aluminium oxide of a few millimeters that prevents the metal from reacting with water. Thus, aluminium requires high temperature to react with water .

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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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