(c) Cu + S → CuS is a redox reaction
Explanation:
We have the following chemical reactions:
(a) K₂CrO₄ + BaCl₂ → BaCrO₄ + 2 KCl
(b) Pb²⁺ + 2 Br⁻ → PbBr₂
(c) Cu + S → CuS
There is a redox reaction where the elements are changing the oxidation state. The reaction (c) is such a case.
Cu + S → CuS
Cu in elemental state have a oxidation number of 0 and in CuS (copper sulfide) have a oxidation number of +2.
S in elemental state have a oxidation number of 0 and in CuS (copper sulfide) have a oxidation number of -2.
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Cu + S → CuS is type of redox reaction. The correct option is (c) only
A redox reaction also known as oxidation-reduction reaction is a type of chemical reaction that involves a transfer of electrons between two species.
The oxidation state of each of the elements did not change. Then, it is not a redox reaction
The oxidation state of each of the elements did not change. Then, it is not a redox reaction
The oxidation state of Cu changed from 0 to +2 and the oxidation state of S changed from 0 to -2. Then, it is a type of redox reaction.
Hence, Cu + S → CuS is type of redox reaction. The correct option is (c) only
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