A-LevelChemistryAtoms, molecules and stoichiometry9701/12 · Feb/Mar 2017 · Q21 Mark

Compounds J and K each contain 40% carbon by mass. What could J and K be?

Ahexose, C6H12O6 starch, (C6H10O5)n

Bpentose, C5H10O5 a hexose, C6H12O6

Cpentose, C5H10O5 sucrose, C12H22O11

Dstarch, (C6H10O5)n sucrose, C12H22O11

✓ Correct answer

B: pentose, C5H10O5 a hexose, C6H12O6

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Topic: Atoms, molecules and stoichiometry, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, Feb/Mar 2017 Paper 1 Variant 2, question 2.

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