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Question

Assertion: The ionisation energy decreases as we go from left to right in a period.

Reason: The nuclear charge increases as we go from left to right in a period but the number of shells remain the same in a period.


  1. Both assertion and reason are true and the reason is the correct explanation for the assertion.

  2. The assertion is true but the reason is false.

  3. The assertion is false but the reason is true.

  4. Both assertion and reason are true but the reason is not the correct explanation for the assertion.


Solution

The correct option is C

The assertion is false but the reason is true.


The factors for ionisation energy are the size of the atom and effective nuclear charge. The ionisation energy increases as we go from left to right in the period as the nuclear charge increases as we go from left to right in the period, but the number of shells remains the same therefore the ionisation energy increases. Therefore, the reason which is given here is true but the assertion given to us is false.

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