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Which of the following statements about gypsum is not correct?

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Which of the following statements about gypsum is not correct?

(a) The final setting time of gypsum is 30 minutes

(b) The solubility of gypsum in water is very poor

(c) Gypsum in insoluble in sulphuric acid

(d) Gypsum is insoluble in hydrochloric acid

The question was asked in an internship interview.

I need to ask this question from Miscellaneous Materials topic in chapter Miscellaneous Materials, Plain and Reinforced Cement Concrete of Construction & Building Materials

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The correct choice is (d) Gypsum is insoluble in hydrochloric acid

The best I can explain: The final setting time of gypsum is 30 minutes. The solubility of gypsum in water is very poor. Gypsum in insoluble in sulphuric acid but soluble in hydrochloric acid.

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