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Answer» mixing of `CuSO_(4)` (a FOUL SMELLING solid) and pyridine (to GIVE the colour) to make the commercial alcohol unfit for drinking mixing of `CuSO_(4)` (to give the colour) and pyridine (a foul smelling solid) to make the commercial alcohol unfit for drinking Mixing of `Cu(OAc)_(2)` and AMMONIA to make the commercial alcohol unfit for drinking. Mixing of `Cu(OAc)_(2)` and pyridineto make the commercial alcohol unfit for drinking. Solution :The commercial alcohol is made unfit for drinking by mixing in it some copper sulphate (to give it colour) and pyridine (a foul smelling liquid). lt is known as denaturation of alcohol.
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