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Which of the following statements about gypsum is not correct?

Which of the following statements about gypsum is not correct? Correct Answer Gypsum is insoluble in hydrochloric acid

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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