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Question
Which of the following reactions is an endothermic reaction?
Options
Burning of coal
Decomposition of vegetable matter into compost
Process of respiration
Decomposition of calcium carbonate to form quick lime and carbon dioxide.
MCQ
Solution
Decomposition of calcium carbonate to form quick lime and carbon dioxide.
Explanation: Calcium carbonate molecules are decomposed by breaking strong connections between calcium (Ca), carbon (C), and oxygen (O) atoms. Energy is necessary to overcome bond energies and separate constituent elements. Endothermic reactions occur when energy is taken from the surroundings through heat.
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