A. 20
B. 32
C. 14
D. 12
Correct Answer:
Option B – 32
Explanation
Molecular mass = vapour density x 2
Mm of XO2 = x + 16(2) = x + 32
vapour density = 32
∴ x + 32 = 32 × 2
x + 32 = 64
x = 64 – 32
x = 32
∴ the relative molecular mass of X is 32
Relative molecular mass = vapour density × 2
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