JEE Main202127 Aug 2021Morning ShiftChemistrys Block ElementsActual
The number of water molecules in gypsum, dead burnt plaster and plaster of Paris, respectively are:
Options
- A2 ,   0 and 0 . 5
- B0 . 5 ,   0 and 2
- C2 ,   0 and 1
- D5 ,   0 and 0 . 5
Correct answer
A. 2 ,   0 and 0 . 5
Step-by-step solution
Gypsum = CaSO 4 · 2 H 2 O Plaster of paris ( POP ) = CaSO 4 · 1 2 H 2 O Dead burnt of plaster = CaSO 4