Which metal is preferred for collecting hydrogen from:
Cold water?

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Solution

Sodium (Na) is preferred for collecting hydrogen from cold water because sodium is present at the top of reactivity series. So, sodium is highly reactive in nature and can react with clod water also.
That is,
$2 N a + 2 H_{2} O (c o l d) ⟶ 2 N a O H + H_{2}$

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