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JEE Main 202127 AugustMorning Shift
Exam
JEE Main
Year
2021
Date
27 August
Shift
Morning Shift
Subject
Chemistry
Chapter
s Block Elements

JEE Main 2021 · 27 August · Morning Shift · Chemistry · s Block Elements

The number of water molecules in gypsum, dead burnt plaster and...

The number of water molecules in gypsum, dead burnt plaster and plaster of Paris, respectively are:

Options

  1. A2,02, 0 and 0.50 . 5
  2. B0.5,00 . 5, 0 and 22
  3. C2,02, 0 and 11
  4. D5,05, 0 and 0.50 . 5

Correct answer

A. 2,02, 0 and 0.50 . 5

Step-by-step solution

Gypsum =CaSO4⋅2H2O= {CaSO}_{4} \cdot 2{H}_{2}O
Plaster of paris (POP)=CaSO4⋅12H2O( POP ) = {CaSO}_{4} \cdot \dfrac{1}{2}{H}_{2}O
Dead burnt of plaster =CaSO4= {CaSO}_{4}
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