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Hydrogen can be prepared by the action o...

Hydrogen can be prepared by the action of dil. `H_(2)SO_(4)` on

A

copper

B

iron

C

lead

D

mercury

Text Solution

Verified by Experts

The correct Answer is:
B
Hydrogen cannot be prepared by the action of dil. `H_(2)SO_(4)` on copper or mercury as these two metals cannot displace hydrogen from acids. Action of dil. `H_(2)SO_(4)`on Pb stops after sometime due to the formation of insoluble `PbSO_(4)`. Only iron reacts rapidly with dil. `H_(2)SO_(4)` to give `H_(2)`.
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Hydrogen peroxide can be prepared by the action of dil. H_(2)SO_(4) or H_(3)PO_(4) on barium peroxide or by bubbling carbon dioxide through a thin paste of barium peroxide. On an industrial scale , it can be prepared by hydrolysis of peroxodisulphuric acid obtained by electrolysis of 50% H_(2)SO_(4) or an equimolar mixture of H_(2)SO_(4) and ammonium sulphate .The strength of H_(2)O_(2) solution can be expressed in a number ways namely normality , molarity , percentage strength and volume of O_(2) produced at N.T.P by decomposition of 1 mL of H_(2)O_(2) acts as an oxidising as well a reducing agent both in acidic and basic media. Hydrogen peroxide is used as

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