Which of the following metal gives hydrogen with all of these reactants: water, acids, alkalis?

F e

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Z n

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M g

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N a

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Solution

The correct option is D $N a$
Sodium, being the most reactive metal, easily reacts with water, acid and base to liberate hydrogen. The reactions are as follows:
$2 N a + 2 H_{2} O \to 2 N a O H + H_{2} 2 N a + H_{2} {S O}_{4} \to {N a}_{2} {S O}_{4} + H_{2} 2 N a + H_{2} {C O}_{3} \to {N a}_{2} {C O}_{3} + H_{2}$

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