Question

Assertion: Effusion rate of oxygen is smaller than nitrogen. Reason: Molecular size of nitrogen is smaller than oxygen

• A. Both assertion and reason are true and reason is the correct explanation of assertion
• B. Both assertion and reason are true but reason is not the correct explanation of assertion
• C. Assertion is true but reason is false
• D. Both assertion and reason are false

Answer 1

The correct option is C Assertion is true but reason is false

​​​​​​Effusion rate of oxygen is smaller than nitrogen as molecular mass of oxygen is greater than nitrogen, as
$\text{Effusion rate}\propto \frac{1}{\sqrt{\text{Molecular mass}}}$
Molecular size of oxygen is smaller than nitrogen.
Hence, assertion is correct but reason is false.