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O-LevelChemistryStoichiometry5070/11 · Oct/Nov 2023 · Q101 Mark

Three compounds are listed. copper(II) nitrate, Cu(NO3)2 zinc sulfate, ZnSO4 sodium thiosulfate, Na2S2O3 Which row shows the element that is present in the greatest percentage by mass in each compound? [relative formula masses, Mr: Cu(NO3)2, 188; ZnSO4, 161; Na2S2O3, 158] copper(II) nitrate, zinc sulfate, sodium thiosulfate

Acopper, oxygen, oxygen
Bcopper, oxygen, sulfur
Coxygen, zinc, sodium
Doxygen, zinc, sulfur

✓ Correct answer

D: oxygen, zinc, sulfur

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About this question

Topic
Stoichiometry, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source
O-Level Chemistry, Oct/Nov 2023 Paper 1 Variant 1, question 10.

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