Question detail

Chemical changes case 047 ph-precision. A student explains pH or neutralisation. Which option avoids vague wording? Focus on that most metals are found compounds that require in Extraction of metals and reduction, 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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MCQ

Type

practice

Style

Topic

Reactivity of metals

Question

A. Chemical changes case 047 ph-precision: Links pH or neutralisation to hydrogen ions, hydroxide ions or water formation for that most metals are found compounds that require
B. Chemical changes case 047 ph-precision: Says strong acid means concentrated acid (Extraction of metals and reduction)
C. Chemical changes case 047 ph-precision: Says neutralisation only means the mixture becomes harmless (that most metals are found compounds that require)
D. Chemical changes case 047 ph-precision: Uses pH numbers without linking them to acidity or alkalinity (Reactivity of metals)

Answer

The correct option is Chemical changes case 047 ph-precision: Links pH or neutralisation to hydrogen ions, hydroxide ions or water formation for that most metals are found compounds that require.

Explanation

The correct option is Chemical changes case 047 ph-precision: Links pH or neutralisation to hydrogen ions, hydroxide ions or water formation for that most metals are found compounds that require. It is correct because it directly supports the approved learning objective to explain that most metals are found as compounds that require chemical reactions for extraction in Extraction of metals and reduction. 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

Misunderstanding Metal Compounds

Students often think that all metals can be found in their elemental form in nature, overlooking that most metals are found as compounds.

Emphasize that most metals require chemical reactions to be extracted from their compounds, and provide examples of common metal ores.

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For Extraction of metals and reduction, which redox focus answer best supports this Unit 4.4 objective: Explain that most metals are found as compounds that require chemical reactions for extraction?