Calcium sulphate is found in nature in two forms: anhydrous calcium sulphate and…

CHEMISTRY · Single correct · CBSE · Chemistry · Acids, Bases and Salts · Acids, Bases and Salts

Problem

Calcium sulphate is found in nature in two forms: anhydrous calcium sulphate and hydrated calcium sulphate. When anhydrous calcium sulphate is heated with coke, sulphur dioxide gas is obtained. When hydrated calcium sulphate is heated to 200∘C200^\circ\text{C}, it forms an anhydrous salt. What is the product formed when hydrated CaSO4\mathrm{CaSO_4} is heated to 125∘C125^\circ\text{C} instead of 200∘C200^\circ\text{C}? (1) (CaSO4)2⋅2H2O(\mathrm{CaSO_4})_2\cdot2\mathrm{H_2O} (2) CaSO4⋅34H2O\mathrm{CaSO_4}\cdot\frac{3}{4}\mathrm{H_2O} (3) CaSO4\mathrm{CaSO_4} (4) CaO+SO3\mathrm{CaO}+\mathrm{SO_3}

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