The metal which displaces hydrogen from a boiling caustic soda solution is:

A s

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Z n

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M g

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F e

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Solution

The correct option is B $Z n$
In electrochemical series, zinc is prior than Hydrogen. So $Z n$ displaces $H_{2}$ from $N a O H$ forming Sodium Zincate. But it doesn't replace $N a$ because of high reactivity of Sodium.
$2 N a O H + Z n \to N a_{2} Z n O_{2} + H_{2} ↑$
(Sodium Zincate)

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