####19. If two compounds have the same empirical formula but different molecular formulae, they must have
(1987, 1M)
(a) different percentage composition
(b) different molecular weight
(c) same velocity
(d) same vapour density
Correct Answer: 19. (b)
Solution:
$$ \begin{aligned} & (d \text { and } l) \text { mixture } \ & \quad+SbCl _5 \end{aligned} $$
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