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

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(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.

Similar Questions

The commercial method of preparation of potassium by reduction of molten $KCl$ with metallic sodium at $850 ^\circ C$ is based on the fact that:

Which of the following properties is $NOT$ correct for alkali metals?

Alkali metals .........

Which one of the following will react most vigorously with water?

Vedclass Test Series

Exam Paper Generator

Online Exam Module