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Q.

The composition of azeotropic mixture of alcohol and water at 1 atm pressure is

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a

95% ethanol and 5% water

b

85% ethanol and 15% water

c

98% ethanol and 2% water

d

90% ethanol and 10% water

answer is C.

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Detailed Solution

The composition of an azeotropic mixture of alcohol and water at 1 atm pressure is 95% ethanol and 5% water.

Ethanol makes up 95.635% of the azeotropic composition of water, while water makes up 4.375%. The boiling point of azeotrope is 78.2, which is lower than the boiling points of either of its ingredients (ethanol is 78.4°C and water is 100°C).

Hence, option C is correct.

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