Question

Assertion :For an element, second ionisation enthalpy will be higher than the first ionisation enthalpy. Reason: Second ionisation enthalpy is sum of energies required to remove two electrons.

• A. Both Assertion and Reason are true and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are true but Reason is not the correct explanation for Assertion
• C. Assertion is true statement but reason is false
• D. Both Assertion and Reason are false statement.

Answer 1

The correct option is A Both Assertion and Reason are true and Reason is the correct explanation for Assertion

1. Second ionisation enthalphy is the energy required to removed second electron from 1 mole of gaseous $1+$ ions to give gaseous $2+$ gives.

2.Second ionisation energy is greater than first ionisation energy because after removal of first electrons, the nuclear charge increases and electrons are held more tightly by the nucleus. This is makes the removal of second electrons difficult and hence requires more energy.