MCQ
Chemical reactions and heat change MCQ - Practice Questions with Answers
Solve 1 Chemical reactions and heat change questions for RAS/RPSC preparation.
Practice questions
Q1Which of the following is not an exothermic reaction?
Explanation
The decomposition of calcium carbonate into calcium oxide and carbon dioxide needs heat, so it is an endothermic reaction and is not exothermic. When water is added to lime, slaked lime forms with the release of heat. Burning natural gas is combustion, and combustion releases heat and light. Respiration is also treated as an exothermic biochemical process because glucose breaks down in cells and releases energy. Therefore, the calcium carbonate decomposition reaction is the only one that does not release heat.
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