Discussion
Assertion (A) : Plaster of Paris is used by doctors for setting fractured bones.
Reason (R) : When Plaster of Paris is mixed with water and applied around the fractured limbs, it sets into a hard mass.
Answer: A
Correct answer: Both A and R are true and R is the correct explanation of A.
Plaster of Paris, calcium sulphate hemihydrate, takes up water and sets into a hard mass of gypsum within minutes. That is precisely why a bandage soaked in it can be moulded round a limb and left to harden, holding the bone still. Both are true and R explains A.
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