Chemistry
Give a reason for the following
(a) Though lead is above hydrogen in the activity series, it is not used to prepare hydrogen.
(b) Potassium and sodium are not used for reaction with dilute hydrochloric acid or dilute sulphuric acid in the laboratory preparation of hydrogen.
Hydrogen
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Answer
(a) Lead reacts with dilute sulphuric acid or hydrochloric acid and forms an insoluble coating of lead sulphate or lead chloride. Therefore, further reaction is prevented. Hence, it is not used to prepare hydrogen.
(b) Potassium and sodium react violently with acid, hence they are not used for reaction with dilute hydrochloric acid or dilute sulphuric acid in the laboratory preparation of hydrogen.
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