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Mass Transfer

Q1:

Pick out the wrong statement.

A Constant pressure distillation can not separate an azeotropic mixture.

B Relative volatility of a binary mixture changes appreciably with the minor change in temperature.

C The relative volatility of a binary mixture at azeotropic composition is unity.

D Flash distillation is practised on wide spread scale in petroleum refinery.

ANS:B - Relative volatility of a binary mixture changes appreciably with the minor change in temperature.

The wrong statement is: "Relative volatility of a binary mixture changes appreciably with the minor change in temperature." Relative volatility refers to the ratio of the vapor pressures of the components in a binary mixture. It is a thermodynamic property that depends on temperature and composition but typically does not change appreciably with minor changes in temperature. Instead, relative volatility tends to change more significantly with changes in composition. Therefore, the statement suggesting that relative volatility changes appreciably with minor changes in temperature is incorrect.



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