Long answer·Standard multi-step (3/5)·No calculator
Difficulty guide
The label describes the problem, not your ability.
1/5 - Foundational
Warm-up setup; checks one basic idea.
2/5 - Routine exam skill
Normal syllabus skill; usually one main rule or interpretation.
3/5 - Standard multi-step
Exam-style problem with multiple steps or a common trap.
4/5 - Hard exam skill
High-end exam problem; combines methods carefully.
5/5 - Challenge
Stretch problem beyond normal exam pressure.
Question
A solution turns red litmus blue. It is accidentally mixed with dilute hydrochloric acid until the final solution is neutral.
Total: 5 marks
(a) What is the nature of the original solution? (1 mark)
(b) Name the type of reaction occurring during neutralisation. (1 mark)
(c) If the original solution was sodium hydroxide, write the balanced equation. (2 marks)
(d) State one everyday use of neutralisation. (1 mark)
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