1.

Find the oxidation states of halogens in the following : (a) Cl_2O (b) KBrO_3 (c) NaClO_4 (d) ClO_2

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Solution :As all the molecules are neutral, sum of the oxidation numbers in each molecule is zero. Assuming the value x for the unknown element, we get <BR> (a) `ul(Cl_2)O`
`2x-2 =0`
`2x=2`
`x= +1`
(b) `K ul(Br)O_3`
`+1 + x -6 =0`
` x= +5`
(c) `NA ul(Cl)O_4`
`1 + x -8 =0`
`x=+7`
(d) `ul(Cl)O_2`
`x-4=0`
`x=+4`


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