If the temperature of a reaction mixture rises without external heating, what type of reaction does this indicate?
Answer and explanation
Correct answer: Exothermic reaction
The governing concept is heat exchange during a chemical reaction. If the mixture becomes warmer without receiving heat from an external source, energy has been released by the reacting substances to their surroundings. Such a reaction is called exothermic, so option B is correct. An endothermic reaction absorbs heat, while photochemical and electrolytic reactions are classified by light or electricity, not simply by a temperature rise.
Frequently asked questions
What is the correct answer to this question?
Exothermic reaction
Why is this the correct answer?
The governing concept is heat exchange during a chemical reaction. If the mixture becomes warmer without receiving heat from an external source, energy has been released by the reacting substances to their surroundings. Such a reaction is called exothermic, so option B is correct. An endothermic reaction absorbs heat, while photochemical and electrolytic reactions are classified by light or electricity, not simply by a temperature rise.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Chemical Reactions and Equations.
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