1. Some more examples of redox reaction are as follows. Identify the reductants and oxidants from them.
2H2S + SO2 ⟶ 3S↓ + 2H2O ... (27)
MnO2 + 4 HCl ⟶ MnCl2 + 2H2O + Cl2 ↑ ... (28)
→ The oxidants and reductants are:
Equation Oxident Reductant
27 SO2 H2S
28 MnO2 HCl
1 Mark Each
2. If oxidation means losing electrons, what is meant by reduction?
→ Reduction means gaining electron(s).
1 Mark
3. Write the reaction of formation of Fe2+ by reduction Fe3+ by making use of the symbol (e-).
→ Fe3+ + e- ⟶ Fe2+1 Mark

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24 August 2019 at 17:02