A) \[\frac{1}{2}{{H}_{2}}+\frac{1}{2}{{I}_{2}}+HI\]
B) \[PC{{l}_{5}}\to PC{{l}_{3}}+C{{l}_{2}}\]
C) \[2CuS{{O}_{4}}+4KI\to C{{u}_{2}}{{I}_{2}}+2{{K}_{2}}S{{O}_{4}}+{{I}_{2}}\]
D) \[CaOC{{l}_{2}}\to C{{a}^{+2}}+OC{{l}^{-}}+C{{l}^{-}}\]
Correct Answer: A
Solution :
| [a] \[\frac{1}{2}{{\overset{0}{\mathop{H}}\,}_{_{2}^{0}}}+\frac{1}{2}{{\overset{0}{\mathop{I}}\,}_{_{2}^{0}}}\to \overset{+1-1}{\mathop{HI}}\,\] | ....(i) | |
| \[\overset{+5}{\mathop{P}}\,\overset{-1}{\mathop{C{{l}_{5}}}}\,\to \overset{+3}{\mathop{P}}\,C{{l}_{3}}+C\overset{0}{\mathop{{{I}_{2}}}}\,\] | .....(ii) | |
| \[2\overset{+2}{\mathop{Cu}}\,S{{O}_{4}}+4\overset{+1-1}{\mathop{KI}}\,\to {{\overset{+1}{\mathop{Cu}}\,}_{2}}\overset{-1}{\mathop{{{I}_{2}}}}\,+2{{K}_{2}}S{{O}_{4}}+{{\overset{0}{\mathop{I}}\,}_{2}}\] | ...(iii) | |
| \[\overset{+2}{\mathop{Ca}}\,O{{\overset{-1}{\mathop{Cl}}\,}_{2}}\to C{{a}^{2+}}+OC{{l}^{-}}+C{{l}^{-}}\] | .....(iv) | |
| Except (4), there occurs a change in O.S. of the reactants and products. Hence, except (4), all other are redox reactions. | ||
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