IGCSE O Level Chemistry Certification Exam Tests
IGCSE O Level Chemistry Practice Test 17
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MCQ 81: Variable valencies are used to indicate ions
MCQ 82: In CuO (Copper Oxide), the valency of Copper is
MCQ 83: In order to get Sodium Sulfite (Na2SO3) as product, the reactants shall be Sulfur Dioxide (SO2) and
MCQ 84: Old paintings became decolorized due to
MCQ 85: Relative molecular mass of Na2CO3 is
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