Study the given Venn diagram.

If 1 represents slaking of lime and 2 represents decomposition of calcium carbonate then P, Q and R could be respectively

Options

A. Reversible change, irreversible change and physical change
B. Periodic change, non-periodic change and physical change
C. Exothermic change, endothermic change and chemical change
D. Endothermic change, exothermic change and chemical change.

Answer

C

Explanation

Decomposition of calcium carbonate is an endothermic, chemical change as calcium carbonate breaks into calcium oxide and carbon dioxide by absorption of heat. Slaking of lime releases a lot of heat hence, it is an exothermic chemical change. Therefore, P should be .exothermic., Q should be .endothermic. and R should be chemical change.