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Question

AB−4+C+2→C+3+A+2 If the Oxidation number of B is -2. Choose the true statement for the above change -

A
O.N. of A decreases by -5
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B
O.N. of C decreases by +1
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C
O.N. of A decreases by +5 and that of C increases by +1
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D
O.N. of A decreases by +5 and that of C decreases by +1
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Solution

The correct option is C O.N. of A decreases by +5 and that of C increases by +1AB−4+C+2→C+3+A+2 From the above equation and the oxidation number of, B we can calculate the O.N of A as follows. x + 4(−2) = −1 x = +7 The oxidation number of A in the L.H.S of the equation is +7 and in the R.H.S it becomes +2. Therefore there is a decrease in the oxidation satate of A by +5 Similarly the O.N of C in the L.H.S is +2 and in the R.H.S is +3. Therefore there is an increase in th O.N of C by +1

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