Give reason for the following:
Though lead is above hydrogen in the activity series, it does not react with dilute hydrochloric acid or dilute sulphuric acid.

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Solution

Lead does not react with hydrochloric acid or dilute sulphuric acid because it forms an insoluble coating of lead sulphate or lead chloride. So, further reaction is prevented.

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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.

Choose terms from the options given in brackets to complete these sentences.

(a) When CuO reacts with hydrogen, .............. is reduced and ............... is oxidized to .............. . $(C u O, H_{2}, C u, H_{2} O)$

(b) Hydrogen is ................ soluble in water. (Sparingly, highly, moderately)

(iron, magnesium, aluminium, sodium, calcium)

(d) Sodium .......... reacts smootly with cold water. (metal, amalgam, in the molten state)

(e) A metal ............. hydrogen in the activity series gives hydrogen with ............... acid or acid.

(above, below, dilute hydrochloric, concentrated hydrochloric, dilute sulphuric).

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