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Which one of the following reactions is a redox reaction? (a) C u S O 4 ​ + 4 N H 3 ​ → C u ( N H 3 ​ ) 4 ​ ] S O 4 ​ (b) N a 2 ​ S O 4 ​ + B a C l 2 ​ → B a S O 4 ​ + 2 N a C l (c) S O 2 ​ + H 2 ​ O → H 2 ​ S O 3 ​ (d) 2 C u S O 4 ​ + 4 K I → C u 2 ​ I 2 ​ + 2 K 2 ​ S O 4 ​ + I 2 ​ .

Which one of the following reactions is a redox reaction?
(a) CuSO4+4NH3Cu(NH3)4]SO4
(b) Na2SO4+BaCl2BaSO4+2NaCl
(c) SO2+H2OH2SO3
(d) 2CuSO4+4KICu2I2+2K2SO4+I2.

Grade:8

2 Answers

Vikas TU
14149 Points
10 months ago
Dear student 
In Option D 
Oxidation number of Cu decreases from +2 to +1 and oxidation number of iodine increases from −1 to 0.
So, D is Cortrect Choice.
ankit singh
askIITians Faculty 614 Points
10 months ago

The reaction in which change in oxidation numbers of some of the atoms takes place is termed as a redox reaction.
(a) CuSO4+2+62+4NH33+1[Cu+2(N3H3+1)4]S+6O42
No change in oxidation number of any of the atoms.
(b) Na2+1S+6O42+Ba+2Cl21Ba+2S+6O42+2Na+1Cl1
No change in oxidation number of any one of the atoms.
(c) S+4O22+H2+1O2H2+1S+4O32
No change in oxidation number of any one of the atoms.
(d) 2Cu+2S+6O42+4K+1I1Cu2+1I21+2K2+1S+6O42+I20.
Oxidation number of Cu decreases from +2 to +1 and oxidation number of iodine increases from 1 to 0.
Thus, out of the above four reactions, the reaction (d) is a redox reaction.

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