Question detail

Chemical changes case 046 salt-method. A student plans a salt preparation method. Which option is most creditworthy? Focus on the species reduced redox reaction in Oxidation and reduction in terms of electrons (HT only), not on a neighbouring Unit 4.4 reaction idea.

Try the question, check the answer, then read the explanation to understand the curriculum point.

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At a glance

MCQ

Type

practice

Style

Topic

Reactivity of metals

Question

A. Chemical changes case 046 salt-method: Uses the correct reactants, separation step and crystallisation idea for the species reduced redox reaction
B. Chemical changes case 046 salt-method: Evaporates to dryness when crystals should be formed carefully (Oxidation and reduction in terms of electrons (HT only))
C. Chemical changes case 046 salt-method: Adds indicator to every salt preparation regardless of method (the species reduced redox reaction)
D. Chemical changes case 046 salt-method: Names a salt but omits how excess solid or solution is handled (Reactivity of metals)

Answer

The correct option is Chemical changes case 046 salt-method: Uses the correct reactants, separation step and crystallisation idea for the species reduced redox reaction.

Explanation

The correct option is Chemical changes case 046 salt-method: Uses the correct reactants, separation step and crystallisation idea for the species reduced redox reaction. It is correct because it directly supports the approved learning objective to (HT only) Identify the species reduced in a redox reaction in Oxidation and reduction in terms of electrons (HT only). 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

Identifying Reduced Species

Students often confuse the species that is reduced with the species that is oxidised in a redox reaction.

To fix this, remember that reduction involves the gain of electrons. Identify the species that gains electrons during the reaction to determine which is reduced.

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