Assertion: Gypsum upon strong heating forms plaster of paris, Reason: Upon strong heating-gypsum loses molecules of water of crystallisation partially.
(a) both A and R are true and R is the correct explanation of assertion
(b) Both A and R are true but R is not the correct explanation of A
(c) A is true, but R is false
(d) A is false, but R is true
Answers
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Answer:
A
Explanation:
(gypsum)CaSO4•2H20 - (plaster of Paris)CaSO4•1/2H20 + 3/2H20
on more heating CaSO4•1/2H2O-(dead burnt plaster)CaSO4 + 1/2 H20
on very strong heating CaSO4 - (lime)CaO + SO3
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From the given question the correct answer is:
(a) both A and R are true and R is the correct explanation of assertion
Assertion: Gypsum upon strong heating forms plaster of paris
Reason: Upon strong heating-gypsum loses molecules of water of crystallisation partially.
Explanation :
(gypsum)CaSO4•2H20 - (plaster of Paris)CaSO4•1/2H20 + 3/2H20
on more heating CaSO4•1/2H2O-(dead burnt plaster)CaSO4 + 1/2 H20
on very strong heating CaSO4 - (lime)CaO + SO3
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