Question

Match the following

• A. I - B; II - C; III - A
• B. I - B; II - C; III - D
• C. I - B; II - A; III - D
• D. I - A; II - D; III - C

Hint:

Remember the sequence: \[ \text{Gypsum} \ \xrightarrow{\text{heating}} \ \text{Plaster of Paris} \ \xrightarrow{\text{strong heating}} \ \text{Dead burnt plaster} \] Gypsum is \(CaSO_4\cdot 2H_2O\), POP is \(CaSO_4\cdot 0.5H_2O\), and dead burnt plaster is anhydrous \(CaSO_4\).

Answer 1

The Correct Option is B

Step 1: Name each calcium sulfate hydrate.
Dihydrate (2H₂O) = Gypsum → I–B. Hemihydrate (0.5H₂O) = Plaster of Paris → II–C. Anhydrous = Dead burnt plaster → III–D.

Step 2: Final Answer:
I–B, II–C, III–D (option 2).