In the apparatus shown, $100\ cm^3$ of a mixture of ethane and ethene is passed repeatedly over liquid A, which absorbs only one of the gases. Liquid A is

Adilute sulphuric acid

Bwater

Caqueous bromine

Daqueous sodium chloride

Explanation

Bromine water adds across the

C=C

bond of ethene only, so the fall in volume gives the volume of ethene present.

Derived from ZIMSEC Chemistry Paper 2, November 2000, Q3

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