The temperature rises during the reaction between hydrochloric acid and sodium hydroxide. What does this show?
Answer and explanation
Correct answer: Neutralisation is exothermic
Hydrochloric acid reacts with sodium hydroxide in a neutralisation reaction: HCl + NaOH → NaCl + H2O. A measurable temperature rise means that the reaction releases heat to the surroundings, so it is exothermic. The formation of water and salt confirms a chemical change. Therefore option A is correct; an endothermic process would absorb heat and usually lower the temperature without external heating.
Frequently asked questions
What is the correct answer to this question?
Neutralisation is exothermic
Why is this the correct answer?
Hydrochloric acid reacts with sodium hydroxide in a neutralisation reaction: HCl + NaOH → NaCl + H2O. A measurable temperature rise means that the reaction releases heat to the surroundings, so it is exothermic. The formation of water and salt confirms a chemical change. Therefore option A is correct; an endothermic process would absorb heat and usually lower the temperature without external heating.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Acids, Bases, and Salts.
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