A-LevelChemistryAtoms, molecules and stoichiometryFeb/Mar 2017Paper 1 Q331 Mark
Which of these statements are always correct? 1 The sum of the oxidation numbers of all the atoms in a compound is zero. 2 The oxidation number of sodium in a salt is positive. 3 The oxidation number of chlorine in a compound is negative.
A1, 2 and 3 are correct
B1 and 2 only are correct
C2 and 3 only are correct
D1 only is correct
✓ Correct Answer
The correct answer is B. This question tests the candidate's understanding of atoms, molecules and stoichiometry within the Chemistrysyllabus. The examiner's mark scheme requires...
📋 Examiner Report & Trap Analysis
Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
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