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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+4NH3→Cu(NH3)4]SO4(b) Na2SO4+BaCl2→BaSO4+2NaCl(c) SO2+H2O→H2SO3(d) 2CuSO4+4KI→Cu2I2+2K2SO4+I2.
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.
The reaction in which change in oxidation numbers of some of the atoms takes place is termed as a redox reaction.(a) CuSO4+2+6−2+4NH3−3+1→[Cu+2(N−3H3+1)4]S+6O4−2No change in oxidation number of any of the atoms.(b) Na2+1S+6O4−2+Ba+2Cl2−1→Ba+2S+6O4−2+2Na+1Cl−1No change in oxidation number of any one of the atoms.(c) S+4O2−2+H2+1O−2→H2+1S+4O3−2No change in oxidation number of any one of the atoms.(d) 2Cu+2S+6O4−2+4K+1I−1→Cu2+1I2−1+2K2+1S+6O4−2+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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