Discussion
Which of the following is a mismatched set ?
Column (A) - Column (B) - Column (C)
Answer: B
The mismatched set is Slaked lime - CaO - Used for lowering the acidity of soil.
CaO, calcium oxide, is quicklime. Slaked lime is calcium hydroxide, Ca(OH)2, made by adding water to quicklime. The use given is right, since lime is spread on acidic soil to neutralise it, but the formula belongs to a different substance, so the set is mismatched.
The other sets match. Bleaching powder, CaOCl2, is used for bleaching cotton and linen in laundries. Plaster of Paris, CaSO4.½H2O, is used for smoothing and coating walls. Gypsum, CaSO4.2H2O, is the raw material of the dental plasters and stones used to make casts of teeth.
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