Question

# A metal which reacts with cold water vigorously producing hydrogen is

A

Gold

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B

Tin

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C

Sodium

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D

Tungsten

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Solution

## The correct option is C SodiumExplanation for correct option:(C) SodiumReaction of metal with cold water:Alkali metals usually have higher reactivity than other metals.Thus an alkali metal can react vigorously with cold water producing Hydrogen gas.This reaction is highly exothermic in nature.The metals such as Sodium, Lithium, and Potassium.The reaction of an alkali metal with cold water produces metal hydroxide. The chemical reaction can be depicted as: $\mathrm{Alkali}\mathrm{metal}+\mathrm{water}\to \mathrm{Metal}\mathrm{Hydroxide}+\mathrm{Hydrogen}$Reaction of Sodium with cold water:When Sodium$\left(\mathrm{Na}\right)$ metal reacts with cold water, it produces sodium hydroxide$\left(\mathrm{NaOH}\right)$ and hydrogen gas$\left({\mathrm{H}}_{2}\right)$ is released.The chemical reaction is depicted below: $2\mathrm{Na}\left(\mathrm{s}\right)+2{\mathrm{H}}_{2}\mathrm{O}\left(\mathrm{l}\right)\to 2\mathrm{NaOH}\left(\mathrm{aq}\right)+{\mathrm{H}}_{2}\left(\mathrm{g}\right)\phantom{\rule{0ex}{0ex}}\left(\mathrm{Sodium}\right)\left(\mathrm{Water}\right)\left(\mathrm{Sodium}\mathrm{hydroxide}\right)\left(\mathrm{Hydrogen}\right)$ Explanation for incorrect options:A. Gold is a transition metal and it will not react with cold water.B. Tin is a non-metal and it will not react with cold water.D. Tungsten is a transition metal and it will not react with cold water.Hence the correct option is C i.e. Sodium.

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