Easy MCQ +4 / -1 PYQ · JEE Mains 2020

When gypsum is heated to 393 K, it forms :

  1. A CaSO<sub>4</sub> . 0.5H<sub>2</sub>O Correct answer
  2. B CaSO<sub>4</sub> . 5H<sub>2</sub>O
  3. C Dead burnt plaster
  4. D Anhydrous CaSO<sub>4</sub>

Solution

CaSO<sub>4</sub>.2H<sub>2</sub>O (Gypsum) $\buildrel {393K} \over \longrightarrow$ <br><br>CaSO<sub>4</sub>.${1 \over 2}$H<sub>2</sub>O(Plaster of paris) + ${3 \over 2}$H<sub>2</sub>O

About this question

Subject: Chemistry · Chapter: s-Block Elements · Topic: Alkali Metals

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