Chemistry
Complete and state whether the reaction is oxidation or reduction.
(a) Cl- - e- - ⟶ ……………
(b) Al - …………… ⟶ Al3+
(c) Pb2+ + …………… ⟶ Pb
(d) Sn4+ + …………… ⟶ Sn2+
Electrolysis
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Answer
(a) Cl- - e- ⟶ Cl
Type: Oxidation
Explanation: The chloride ion loses an electron to become a neutral chlorine atom. Since losing an electron is an oxidation reaction, hence this reaction is an oxidation reaction.
(b) Al - 3e- ⟶ Al3+
Type: Oxidation
Explanation: The neutral aluminum atom loses 3 electrons to form a trivalent positive ion. Since losing an electron is an oxidation reaction, hence this reaction is an oxidation reaction.
(c) Pb2+ + 2e- ⟶ Pb
Type: Reduction
Explanation: The lead ion gains 2 electrons to cancel out its positive charge, becoming neutral lead metal. Since gaining an electron is a reduction reaction, hence this reaction is a reduction reaction.
(d) Sn4++ 2e- → Sn2+
Type: Reduction
Explanation: Tin changes from +4 to +2 oxidation state. This decrease means it gains 2 electrons. Since gaining an electron is a reduction reaction, hence this reaction is a reduction reaction.
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