Chemistry
State whether the following conversions are oxidation or reduction reactions.
(a) PbO2 + SO2 ⟶ PbSO4
(b) Cu2+ + 2e- ⟶ Cu
(c) K ⟶ K+ + e-
(d) 2Cl- - 2e- ⟶ Cl2
Hydrogen
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Answer
(a) Oxidation, gain of oxygen
(b) Reduction, gain of electron
(c) Oxidation; loss of electron
(d) Oxidation, loss of electron
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Give reasons
(a) Hydrogen is collected by the downward displacement of water and not of air, even though it is lighter than air.
(b) A candle brought near the mouth of a jar containing hydrogen gas starts burning but is extinguished when pushed inside the jar.
(c) Apparatus for laboratory preparation of hydrogen should be airtight and away from a naked flame.
Write half-reactions for the following reaction :
A+ + B ⟶ A + B+ and name the following:
(a) oxidizing agent
(b) substance oxidized
(c) reducing agent.
State, giving reasons, whether the substances printed in bold letters have been oxidised or reduced.
(a) PbO + CO ⟶ Pb + CO2
(b) Mg + 2HCl ⟶ MgCl2 + H2
(c) H2S + Cl2 ⟶ 2HCl + S
(d) Cl2 + H2S ⟶ 2HCl + S
Is it essential that oxidation and reduction must occur side by side in a chemical reaction? Explain.