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Why CaSO4 is not used in the crystallisation test?

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in Basic Civil Engineering by (111k points)
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

The question was asked in exam.

The origin of the question is Tests on Stones topic in division Materials for Construction of Basic Civil Engineering

1 Answer

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Best answer
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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