Question

9. Assertion : First ionisation energy for nitrogen is lower than oxygen.
Reason: Across a period effective nuclear charge decreases
(a)Assertion & reason is correct, reason is correct explanation of assertion
(b) Assertion & reason is correct, reason is not correct explanation of assertion
(c)Assertion is correct but reason incorrect. (d)Both incorrect.​

Answer 1

Answer:(c)

Explanation:this is an exception the electronic configuration of nitrogen shows half filled p orbital so it is tougher to remove electron from here but that of oxygen is 2p4 so it is comparitively easy to take out electron .also effective nuclear charge increases along the period as electron is added in the same shell.

HOPE THIS HELPS

Answer 2

Answer:

Assertion is False, Reason is True

Explanation: