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Why CaSO4 is not used in the crystallisation test?

(a) Costly compound

(b) Low solubility in water

(c) Increases time taken for test

(d) Releases toxic fumes

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The correct option is (b) Low solubility in water

Easiest explanation: Crystallisation of CaSO4 in pores causes decay of stones and the low solubility in water prevent the use of this compound in the test.

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