Which of the following will replace hydrogen from acids to form salts?
$C u, H g, N a, A g$

Copper

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Mercury

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Sodium

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Silver

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Solution

The correct option is C Sodium
Only those metals which are more reactive than hydrogen, displace hydrogen from acids to form salts and evolve hydrogen gas. Out of the given elements, only $N a$ is a metal which is more reactive than hydrogen as the reactivity series follows the order:
$N a > P b > H > C u > H g > A g$

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