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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 ?
I. Zinc/conc. `H_(2)SO_(4)`
II. Zinc/ `HNO_(3)`
III. Pure zinc/dil. `H_(2)SO_(4)`

A

I and II

B

I, II and III

C

III only

D

I and III

Text Solution

Verified by Experts

The correct Answer is:
B
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