Question

Assertion: Vapour density of sulphur vapour relative to oxygen is 2 because sulphur atom is twice as heavy as that of oxygen atom.
Reason: Vapour density depends upon the molecular state of the substance in vapour state.

• A. If both (A) and (R) are correct and (R) is the correct explanation of (A).
• B. If both (A) and (R) are correct but (R) is not the correct explanation of (A).
• C. If (A) is correct but (R) is wrong.
• D. If (A) is wrong but (R) is correct.
• E. If both (A) and (R) are wrong.

Answer 1

Answer: (C)

If (A) is correct but (R) is wrong.

$\begin{array}{c}\text{Molecular weight of oxygen}=32\\ \text{Molecular weight of Sulphur}=64\\ \text{Vapour density of Sulphur}=2\times \left(\text{V.D of oxygen}\right)\end{array}$

$\begin{array}{c}\text{Vapour density depends on Molar mass but not on molecular state}\\ \text{Hence Assertion is true but reason is wrong.}\end{array}$