Hydrogen is not obtained when zinc reacts with:

Cold water

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Hot

N a O H

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C o n c . H_{2} S O_{4}

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Dil.

H C l

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Solution

The correct option is C $C o n c . H_{2} S O_{4}$
Zinc does not react with cold water. Also, with concentrated sulphuric acid,

$Z n + c o n c . H_{2} S O_{4} \to Z n S O_{4} + S O_{2} ↑ + H_{2} O$

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