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Q.

Which liquid has the highest vapour pressure at 25°C?

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a

 Propanol, C3H7OH

b

 Butane, C4H10

c

 Octane, C8H18

d

 Glycerol, C3H5(OH)3

answer is A.

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Detailed Solution

At 25 degrees Celsius, butane molecules will all be available as gas molecules. The vapour pressure at this temperature is almost 2.30 ATM which is highest among the given options.

Thus, correct option is A.

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Which liquid has the highest vapour pressure at 25°C?