Question detail
Which of the following best describes the standard enthalpy of neutralisation (ΔH°n) for an acid–base reaction (A-level cue b95ef5dc focus)
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Energetics
Question
- A. The enthalpy change when one mole of an acid reacts with one mole of a strong base to give a salt and water.
- B. The enthalpy change when one mole of a salt is dissolved in water to give a neutral solution. (A-level cue b95ef5dc distractor 1)
- C. The enthalpy change when one mole of a compound is formed from its elements in their standard states. (A-level cue b95ef5dc distractor 2)
- D. The enthalpy change when one mole of a compound reacts completely with oxygen to give CO₂ and H₂O. (A-level cue b95ef5dc distractor 3)
Answer
The enthalpy change when one mole of an acid reacts with one mole of a strong base to give a salt and water.
Explanation
The correct option is The enthalpy change when one mole of an acid reacts with one mole of a strong base to give a salt and water.. The enthalpy change when one mole of an acid reacts with one mole of a strong base to give a salt and water. is correct because it supports the objective: Define standard enthalpy changes for formation, combustion and neutralisation where appropriate.. The reasoning stays within Enthalpy change and avoids drifting into a similar A-Level Chemistry idea. This version is uniquely anchored to Enthalpy change. Retrieval anchor: A-level cue b95ef5dc.
Common mistake
Confusing Enthalpy Changes
Students often confuse standard enthalpy changes for formation with those for combustion, leading to incorrect calculations.
To fix this, remember that the standard enthalpy change of formation refers to the enthalpy change when one mole of a compound is formed from its elements in their standard states, while the standard enthalpy change of combustion is the enthalpy change when one mole of a substance is completely burned in oxygen. Use the correct formula for each type of enthalpy change and ensure you know the definitions clearly.
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