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Q.

Consider the following statements.
A) Gypsum contains a low percentage of calcium than plaster of paris
B) Plaster of paris can be reobtained by hydration of dead plaster
C) Gypsum looses 3/2 of its water of crystallisation forms plaster of paris at 120°C
D) Plaster of paris can be obtained by partial oxidation of gypsum
Arrange them in the order of true/false

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a

TFTF

b

FFTF

c

TTFF

d

TTTT

answer is A.

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Detailed Solution

detailed_solution_thumbnail

Gypsam contains a low % of Ca than plaster of paris.
Plaster of paris cann’t be reobtained by hydration of dead plaster
Gypsum looses $\frac{3}{2}$ of its water of crytallisation forming plaster of paris at 120°C.
Plaster of paris cann’t be obtained by partial oxidation of gypsum

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