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The chemical composition of quick lime is ____________

(a) CaS

(b) CaO

(c) MgO

(d) MgS

The question was posed to me during a job interview.

This intriguing question comes from Lime topic in division Glass, Lime, Clay Products & Bricks of Construction & Building Materials

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Best answer
The correct choice is (b) CaO

The best explanation: The chemical composition of quick lime is CaO. It is obtained by calcination of relatively pure limestone. Quick lime has a great affinity for moisture.

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