Question detail
Chemical changes case 036 ph-precision. A student explains pH or neutralisation. Which option avoids vague wording? Focus on how evaporation and crystallisation produce pure dry salt in Soluble salts, not on a neighbouring Unit 4.4 reaction idea.
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Reactions of acids
Question
- A. Chemical changes case 036 ph-precision: Links pH or neutralisation to hydrogen ions, hydroxide ions or water formation for how evaporation and crystallisation produce pure dry salt
- B. Chemical changes case 036 ph-precision: Says strong acid means concentrated acid (Soluble salts)
- C. Chemical changes case 036 ph-precision: Says neutralisation only means the mixture becomes harmless (how evaporation and crystallisation produce pure dry salt)
- D. Chemical changes case 036 ph-precision: Uses pH numbers without linking them to acidity or alkalinity (Reactions of acids)
Answer
The correct option is Chemical changes case 036 ph-precision: Links pH or neutralisation to hydrogen ions, hydroxide ions or water formation for how evaporation and crystallisation produce pure dry salt.
Explanation
The correct option is Chemical changes case 036 ph-precision: Links pH or neutralisation to hydrogen ions, hydroxide ions or water formation for how evaporation and crystallisation produce pure dry salt. It is correct because it directly supports the approved learning objective to describe how evaporation and crystallisation produce a pure dry salt sample in Soluble salts. The other options are incorrect because they blur a Unit 4.4 concept boundary: acid versus alkali versus base, oxidation versus reduction, displacement versus reduction, electrolysis versus electroplating, anode versus cathode, positive versus negative ions, oxidation state versus ionic charge, or strong acid versus concentrated acid.
Common mistake
Evaporation and Crystallisation Confusion
Students often confuse the processes of evaporation and crystallisation, thinking they are the same step in producing a pure dry salt sample.
Clarify that evaporation is the process of removing the solvent to concentrate the solution, while crystallisation is the formation of solid crystals from the concentrated solution.
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