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JEE Main · 2020 · 08 Jan 2020 · Shift 1 · s-Block Elements

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When gypsum is heated to 393 K , it forms :
  1. (A)✓ Correct
  2. (B)Dead burnt plaster
  3. (C)Anhydrous
  4. (D)

Answer: (A)

Solution

Gypsum is . Heating it to about K drives off three-quarters of its water, moles per formula unit, leaving plaster of Paris, . Heating beyond K would give the anhydrous dead-burnt salt, but at K the product is plaster of Paris.

JEE Main · 2020 · 08 Jan 2020 · Shift 1 · Single correct option

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