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B
Reaction (ii)
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C
Both A and B
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D
None of the above
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Solution
The correct option is B Reaction (ii) In case (i), oxidation state remains same. In case (ii), C is oxidised. In reaction (i), +3−3(CN)2x=3→C2O2−42x−8=−22x=6x=3 In reaction (ii), (CN)2x=3→NH2CONH2−3+2+x−2−3+2=0x=4 C3+→C4++e−