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Which of the following reactions is an endothermic reaction? i) Burning of coal ii) Decomposition of vegetable matter into compost iii) Process of respiration iv)

Which of the following reactions is an endothermic reaction?

i) Burning of coal

ii) Decomposition of vegetable matter into compost

iii) Process of respiration

iv) Decomposition of calcium carbonate to form quick lime and carbon dioxide

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