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Which combination cannot be used for the...

Which combination cannot be used for the preparation of hydrogen gas in the laboratory?
Zn/conc.`H_(2)SO_(4)" II) " Zn//dil.HNO_(3)`
III) pure Zn/dil. `H_(2)SO_(4)`
IV) granulated Zn/dil. HCl

A

I and II

B

I, II, III

C

III only

D

I and III

Text Solution

Verified by Experts

The correct Answer is:
B
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Which combination cannot be used for the preparation of hydrogen gas in the laboratory ? I. Zinc/conc. H_(2)SO_(4) II. Zinc/ HNO_(3) III. Pure zinc/dil. H_(2)SO_(4)

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