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MCQ
Which of the following is a redox reaction?
Unit-7 Electrochemistry
A NaCl + AgNO3 -> AgCl + NaNO3
B NaOH + HCl -> NaCl + H2O
C CaCO3 -> CaO + CO2
D CuO + H2 -> Cu + H2O
Explanation

Copper is reduced and hydrogen is oxidized simultaneously.

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