Practice question

MCQ

Question

Which of the following reactions involves both oxidation and reduction?

Options

Choose one · Correct answer highlighted

HCl + NaOH → NaCl + H₂O CaCO₃ → CaO + CO₂ 2PbO + PbS → 3Pb + SO₂ Correct NaCl + KBr → NaBr + KCl

Explanation

In 2PbO + PbS → 3Pb + SO₂, Pb (+2 in PbO) is reduced to 0, and S (-2 in PbS) is oxidized to +4.

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