Assertion (A): K, Rb and Cs form superoxides. | vedclass

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(C) $K, Rb,$ and $Cs$ form superoxides when they are burnt in the air. \ As we move down the group,the size of the alkali metal cation increases from

Vedclass · Accepted Answer

$A$ is true,$R$ is false

Vedclass · Answer

(C) $K, Rb,$ and $Cs$ form superoxides when they are burnt in the air. \ As we move down the group,the size of the alkali metal cation increases from $K^+$ to $Cs^+$. \ The stability of superoxides is determined by the lattice energy; as the size of the cation increases,the lattice energy decreases,which leads to a decrease in the stability of the superoxide. \ Therefore,the stability of superoxides decreases from $K$ to $Cs$. \ Thus,Assertion $(A)$ is true,but Reason $(R)$ is false.

Assertion $(A): K, Rb$ and $Cs$ form superoxides. \\ Reason $(R):$ The stability of superoxides increases from $K$ to $Cs$ due to decrease in lattice energy.

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