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Explanation:

22) The sea-water contains a mixture of salt and some other bigger size of impurities and a mixture of several gases in seawater. Due to other bigger size of impurities, seawater is classified as a heterogeneous mixture while due to a mixture of several gases and salt in seawater it is classified as homogeneous mixture.

23) Chromatography is a technique used for the separation of a mixture of solutes brought about by distribution of dissolved material between two immiscible phases, one of which is mobile phase and the other part is stationary phase. It is useful in forensic science to detect and identify trace amounts of substances in the contents of bladder or stomach.

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