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Q.

Hydrogen is not obtained when zinc reacts with

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a

Cold water

b

Dil.HCl

c

Dil.H2SO4

d

Hot NaOH (20%)

answer is A.

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Detailed Solution

Zn +Dil HCl →ZnCl2 +H2

Zn +Dil H2SO4 →ZnSO4 +H2

Zn +Hot NaOH  →Na2ZnO2 +H2

Zinc is a low reactive metal which does not react with cold water and hence no gas is evolved.

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