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Which of the following should be added to the plaster of Paris in order to increase its setting time?

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Which of the following should be added to the plaster of Paris in order to increase its setting time?

(a) Alum

(b) Potassium sulphate

(c) Potassium nitrate

(d) Citric acid

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The correct choice is (d) Citric acid

To explain I would say: To increase the setting time of the plaster of Paris, suitable retarders are added in it. Citric acid, clay, gum, glue, starch, etc. are all examples of such retarders.
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