A compound which is prepared from gypsum has a property of hardening when mixed with water. I identify the compound and write its chemical formula. Write the chemical equation for its preparation. Mention any one use of the compound.

A compound which is prepared from gypsum has a property of hardening w

1.	A compound which is prepared from gypsum has a property of hardening when mixed with water. I identify the compound and write its chemical formula. Write the chemical equation for its preparation. Mention any one use of the compound.
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