Which of the tubes in $(a)$ and $(b)$ will be more effective as a condenser in the distillation apparatus?
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Tube $(a)$ will be more affective as a condenser in the distillation apparatus. Presence of marbles increases the surface area that comes in contact with the vapours. This allows more time for condensation of vapours and hence the first column would be more effective than the second column without marbles.
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