AP EAMCET202119 Aug 2021Morning ShiftChemistrys Block ElementsActual
Assertion (A): K , Rb and Cs form superoxides Reason (R): The stability of superoxides increases form K to Cs due to decrease in lattice energy.
Options
- ABoth A and R are true and R is a correct explanation for A
- BBoth A and R are true but R is not a correct explanation for A
- CA is true, R is false
- DA is false, R is true
Correct answer
C. A is true, R is false
Step-by-step solution
K ,   Rb ,   Cs form superoxides when they are burnt in the air. As we down the group then the size of atom from K to Cs increases so that the lattice energy decreases hence the stability of superoxide also decreases.