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What does a decrease in the temperature of the reaction mixture generally indicate during a chemical reaction?

Answer and explanation

Correct answer: Absorption of heat

A fall in the temperature of the reaction mixture generally means that the reaction is absorbing heat from its surroundings. Such reactions are called endothermic reactions. In contrast, exothermic reactions release heat and generally cause a temperature rise, so option B is incorrect. Formation of a gas or a metal is not a necessary indication of a temperature decrease.

Related tags

ScienceClass 10Chemical ReactionsEndothermic ReactionTemperature ChangeHeat Absorption

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