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Redox Reactions

Question
CBSEENCH11006740

Assign oxidation number of the underlined elements in each of the following species:
straight H subscript 4 bottom enclose straight P subscript 2 end enclose straight O subscript 7



Solution
straight H subscript 4 bottom enclose straight P subscript 2 end enclose straight O subscript 7
Let the oxidation number of P = x
Writing the oxidation number of each atom at the top of its symbol.
                   +1        x - 2
                   H4        P2O7
Sum of the oxidation number of various atoms = 0
                        4(+1)+ 2x + 7(-2) = 0
i.e.                           x - 5 = 0
or                                x = +5
therefore space space space space Oxidation space number space of space straight P space in space straight H subscript 4 straight P subscript 2 straight O subscript 7 space equals space plus 5