A-LevelChemistryAtoms, molecules and stoichiometry9701/12 · Feb/Mar 2017 · 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
B: 1 and 2 only are correct
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