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Question

Which of the following does not represent redox reaction?

A
Cr2O27+2OHCrO24+H2O
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B
SO25+2I+2HI2+SO24
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C
2Ca(OH)2+2Cl2Ca(ClO)2+CaCl2+2H2O
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D
PCl5PCl3+Cl2
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Solution

The correct option is A Cr2O27+2OHCrO24+H2O
PCl5PCl3+Cl2
+5 +3 redox reaction
2Ca(OH)2+2Cl2Ca(ClO)2+CaCl2+2H2O
0 +1 -1 redox reaction
SO25+2I+2HI2+SO24
-1 0 redox reaction
Cr2O27+2OHCrO24+H2O
+6 +6
Since, there is no change in oxidation state in this reaction, it is not a redox reaction.

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