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What is the enthalpy of heat for dissolving quicklime and water?

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in Chemistry – Class 11 by (148k points)
What is the enthalpy of heat for dissolving quicklime and water?

(a) 55 kJ/mol

(b) 63 kJ/mol

(c) 75 kJ/mol

(d) 78 kJ/mol

The question was asked in final exam.

Enquiry is from s-Block Elements topic in chapter s-Block Elements of Chemistry – Class 11

1 Answer

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Best answer
Right choice is (b) 63 kJ/mol

Best explanation: Calcium hydroxide is prepared by dissolving quicklime and water and the enthalpy change for this reaction is 63 kJ/mole (the sign is negative). Here the chemical formulae for quicklime and Calcium hydroxide are CaO and Ca(OH)2 has twice respectively.

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