A metal which reacts vigorously with cold water producing hydrogen is _______.

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Zinc

Mercury

Sodium

Tungsten

answer is B.

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Detailed Solution

Sodium reacts vigorously with cold water producing hydrogen gas.

Since sodium is one of the most reactive metals in the periodic table, it reacts violently when it comes in contact with cold water. The reaction releases heat hence it is also an exothermic reaction.
2Na(s) + 2H₂O (l) + 2NaOH (aq) + H₂(g)

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