1.

Calculate the oxidation number of the underlined element in the following ions. ul(N)H_(4)^(+)

Answer»

Solution :`NH_(4)^(+)` : Let the oxidation number of N in `NH_(4)^(+)` bei X. The oxidation number of each hydrogen is +1. SINCE `NH_(4)^(+)` has a charge equal to +1, the sum of oxidation NUMBERS of all atoms in it must be equal to +1. Therefore,
`(x)+(+1)xx4=+1`
or `x=+1-4=-3`
Hence, the oxidation number of N in `NH_(4)^(+)` ion is -3.


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