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3.1.8
Inorganic Ions
Analytical deep dive — question counts, mark distribution, mastery curves, command-word breakdowns, and examiner narrative analysis.
Questions
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Total marks
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Marks / Q
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Accessibility
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Mastery
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Student strength
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At a glance
3.1.8 · Inorganic Ions
8YRSYNTHESIS
3.1.8 (Inorganic Ions) sits within Biological molecules. This sub-section was not tested in the 2017–2024 dataset window, so analytical signals are unavailable here.
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Question type split
By marks · compound to dominant
0MARKS
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marks
Knowledge0.0%0 marks
Application0.0%0 marks
Calculation0.0%0 marks
(by marks; compound rows assigned to dominant type):
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Credit terms — quick reference
Mark scheme tier-locked
0TERMS
Tier 1 · Always credit
Tier 2 · Sometimes credit
Reject · Never credit
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Question patterns
Recurring formats & tariff structure
0PARAGRAPHS
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Year-over-year presence
P1 + P3 · 2017–2024
0YEARS
| Year | Questions | Total marks | Mean accessibility | Mean mastery |
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Mark scheme intelligence
2017–2024 mark scheme corpus
0TERMS
Marks in this sub-section are typically awarded for precise terminology and correct application of biological principles. Sequential mark schemes — where each mark requires building on the previous one — are common in multi-mark questions; stating the first step without progression rarely earns more than one mark. Calculation marks are typically split between method (correct setup and value extraction) and answer (accurate numerical result), allowing partial credit when arithmetic errors occur.
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Where students lose marks
Examiner-anchored error patterns
0CASE STUDIES
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Difficulty signals
Performance metric synthesis
—PP GAP