If humid air is polluted by chlorine discharged, the air can be restored by sprinkling
solid MnO\(_{2}\)
acidified KMnO\(_{4}\)
acidified FeSO\(_{4}\)
saturated NaCl(aq)
Explanation
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Discussions (8)
If humid air is polluted by chlorine discharged, the air can be restored by sprinkling
A. solid MnO2
B. acidified KMnO4
C. acidified FeSO4
D. saturated NaCl(aq)
*Explanation*
Hydrochloric acid is not an oxidizing agent but can be oxidized by very strong oxidizing agents, liberating chlorine gas.
AQUEOUS hydrochloric acid (HCl) reacts with potassium permanganate (KMnO4)[Not Acidified] to produce potassium chloride (KCl), Manganese chloride (MnCl2), water (H2O) and chlorine gas (Cl2).
Manganese dioxide when reacts with hydrochloric acid forms Manganese chloride, water and chlorine.
Potassium permanganate is a very strong oxidizing agent and can, therefore, be used as an oxidant in a wide spectrum of chemical reactions.
The acidified potassium manganate(VII) solution oxidizes alkene by breaking the carbon-carbon double bond and replacing it with two carbon-oxygen double bonds. This is used in test for *UnSaturation* .
The correct answer is C. acidified FeSO₄.
Explanation (WAEC standard):
Chlorine gas is a strong oxidizing agent and is poisonous. To remove it from humid air, a substance that can reduce chlorine to harmless chloride ions (Cl⁻) is needed.
Acidified FeSO₄ (iron II sulphate) contains Fe²⁺ ions, which reduce Cl₂ to Cl⁻, while Fe²⁺ is oxidized to Fe³⁺:
Cl_2 + 2Fe^{2+} \rightarrow 2Cl^- + 2Fe^{3+}
Why the others are wrong:
A. Solid MnO₂ – does not react with chlorine to remove it.
B. Acidified KMnO₄ – is an oxidizing agent, not suitable for removing chlorine.
D. Saturated NaCl(aq) – may dissolve a little chlorine but does not neutralize it effectively.
Final Answer: C
