Question

Assertion(A): The first ionization enthalpy of 15th group elements is greater than that of the 16th group elements
Reason(R) :The elements of 15th group have half filed p subshell
(i) Both A and R are true and R is the correct explanation of A.
Both A and R are true and R is not the correct explanation of A.
A is true and R is false.
R is true and A is false
Both A and R are false.​

Answer 1

Answer:

Both A and R are correct and R is the correct explanation of A.

Explanation:

The elements of 15th group have half filled p subshell because of which there is symmetry and are therefore more stable than corresponding 16th group elements . Hence the first ionisation enthalpy of 15th group elements is greater than that of the 16th group elements.