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  9. Q64

MPSC State Service 2020 · GS · Question 64 of 97

Which of the following are Oxidation-reduction reactions? a. 2Mg + O2 ⇾ 2 MgO b. MnO2 + 4 HCl ⇾ MnCl2 + 2 H2O + Cl2 c. 2 Na + Cl2 ⇾ 2NaCl d. 2NaBr + H2O ⇾ 2NaOH + Br2

Chemistry

  1. Aonly a, d
  2. BOnly b, c
  3. COnly a, b
  4. DAll of the aboveCorrect

Answer: D. All of the above

Explanation

All four are redox reactions: Mg/O2, MnO2/HCl, Na/Cl2 and NaBr/H2O all involve electron transfer (oxidation-number changes).

Source: MPSC Rajyaseva Prelims 2020 – GS Paper I (Set D), official paper

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