O Level Chemistry e-Book's MCQs - Complete
Valency and Chemical Formula App's Quiz & e-Book PDF Download - 82
Apps:
MCQ 82:
In CuO (Copper Oxide), the valency of Copper is
- +1
- +2
- −1
- −2
b
O Level Chemistry App & e-Book Tests PDF Download
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O Level Chemistry MCQs eBook Download
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