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AIIMS 2010
Exam
AIIMS
Year
2010
Subject
Chemistry
Chapter
p Block Elements (Group 15, 16, 17 & 18)

AIIMS 2010 · Chemistry · p Block Elements (Group 15, 16, 17 & 18)

Assertion : Helium has the highest value of ionisation energy among...

Assertion : Helium has the highest value of ionisation energy among all the elements known. Reason : Helium has the highest value of electron affinity among all the elements known.

Options

  1. AIf both assertion and reason are true and reason is the correct explanation of assertion
  2. BIf both assertion and reason are true but reason is not the correct explanation of assertion
  3. CIf assertion is true but reason is false
  4. DIf both assertion and reason are false.

Correct answer

C. If assertion is true but reason is false

Step-by-step solution

He contains fully filled 1s21 s^2 orbital which has more penetrating effect and is very close to the nucleus and hence has higher value of ionisation energy.
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