Which of the following pair will not produce dihydrogen gas?

$C u + H C l$ (dil)

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$F e + H_{2} S O_{4}$

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$M g + s t e a m$

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$N a + a l c o h o l$

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Solution

The correct option is A
$C u + H C l$ (dil)

Copper is relatively an unreactive metal when compared to hydrogen and thus copper will not displace hydrogen from $H C l$ to give $C u C l_{2}$ and $H_{2}$ gas.

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