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Reaction of Metals with Bases

Which metal f...

Question

Which metal forms hydrogen gas when reacts with cold water ?

A

Na

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B

Mg

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C

Fe

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D

Zn

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Solution

The correct option is A Na
Na reacts with cold water to give metal oxide and hydrogen gas,

$2 N a + H_{2} O \to N a_{2} O + H_{2}$

which further reacts to form hydroxide.

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