Consider the following statements regarding Plaster of Paris and Gypsum: 1. Gypsum is heated at exactly 373 K to obtain Plaster of Paris; heating it above this temperature produces anhydrous calcium sulphate, known as 'dead burnt plaster'. 2. Plaster of Paris is calcium sulphate hemihydrate, which on mixing with water changes back to gypsum forming a hard solid mass. 3. The setting of Plaster of Paris is an endothermic reaction accompanied by contraction in volume. Which of the statements given above is/are correct?

Options:

• A: 2 and 3 only
• B: 1 and 2 only
• C: 1 and 3 only
• D: 1, 2 and 3

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