Q.

Dead burnt gypsum on warming with water gives

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a

Gypsum

b

Plaster of Paris

c

Cement clinker

d

Remains as it is

answer is D.

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Detailed Solution

When gypsum is allowed to heat above 120°C, it loses the whole of water of crystallisation. The resulting anhydrous CaSO4 is called "Dead burnt Plaster" because it loses the properties of Setting with water Mean dead burnt gypsum on warming with water remains as it is. NOTE :Plaster of paris did not lose the properties of setting with water
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Dead burnt gypsum on warming with water gives