Which of the following is a non-metal displacement reaction?

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$2 K + 2 H_{2} O \to 2 KOH + H_{2}$

$2 H_{2} O_{2} \to 2 H_{2} + O_{2}$

${CaCO}_{3} \to CaO + {CO}_{2}$

$H_{2} {CO}_{3} \to H_{2} O + {CO}_{2}$

answer is A.

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Detailed Solution

The non-metal displacement reactions involve the displacement of hydrogen and in some cases oxygen.

All alkali and some alkaline earth metals, such as Ca, Sr and Ba, displace hydrogen from cold water and are strong reducing agents.

2K(s)+2H₂O(l)⟶2KOH(aq)+H₂(g)

Ba(s)+2H₂O(l)⟶Ba(OH)₂(aq)+H₂(g)

The hydrogen displaced from water has an electropositive character. In the above reactions, the more electropositive K and Ba displace the relatively less electropositive Hydrogen from H₂O.

Hence, it is a non-metal displacement reaction.

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