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JEE Main 20208 JanuaryMorning Shift

Exam: JEE Main
Year: 2020
Date: 8 January
Shift: Morning Shift
Subject: Chemistry
Chapter: s Block Elements

JEE Main 2020 · 8 January · Morning Shift · Chemistry · s Block Elements

When gypsum is heated to 393K, it forms:

When gypsum is heated to

393K,

it forms:

Options

AAnhydrous $CaS{O}_{4}$
B $CaS{O}_{4} \cdot 5{H}_{2}O$
C $CaS{O}_{4} \cdot 0.5{H}_{2}O$
DDead burnt plaster

Correct answer

C. $CaS{O}_{4} \cdot 0.5{H}_{2}O$

Step-by-step solution

CaS{O}_{4} .2{H}_{2} O\overset{393K}{\to} CaS{O}_{4} . \dfrac{1}{2} {H}_{2} O

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