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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

Sodium


Explanation for correct option:

(C) Sodium

Reaction 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:

Alkalimetal+waterMetalHydroxide+Hydrogen

Reaction of Sodium with cold water:

  • When SodiumNa metal reacts with cold water, it produces sodium hydroxideNaOH and hydrogen gasH2 is released.
  • The chemical reaction is depicted below:

2Na(s)+2H2O(l)2NaOH(aq)+H2(g)(Sodium)(Water)(Sodiumhydroxide)(Hydrogen)

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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