passwella.
Menu

JAMB Chemistry 1982 Question 13

Question 13

Redox Reactions

Which of the following is NOT a redox reaction?

  1. A.2HNO2 + 2HI → 2H2O + 2NO + I2
  2. B.Zn + H2SO4 → ZnSO4 + H2
  3. C.Ca(HCO3)2 → CaCO3 + H2O + CO2
  4. D.4FeO + O2 → 2Fe2O3
  5. E.2Na + Cl2 → 2NaCl.
Show the answer and explanation

Answer: C (Ca(HCO3)2 → CaCO3 + H2O + CO2)

Explanation

In the decomposition of calcium hydrogen carbonate no element changes its oxidation number (Ca +2, C +4, O −2, H +1 throughout), so it is not redox.