TAN YI XIAN's answer to Clara's Secondary 3 A Maths Singapore question.

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TAN YI XIAN
Tan Yi Xian's answer
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Answer is D. Because Zn is oxidised (increase in oxidative state from 0 to +2) to form Zn2+, while Cu2+ is reduced (decrease in oxidative state from +2 to 0) to form Cu metal.