Bromine reacts with the hot aqueous alkali to give bromide and bromate. What is the change that is brought about in the oxidation state of bromine to bromate?

- 1

+ 5

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0

+ 5

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0

+ 7

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None of these

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Solution

The correct option is C $0$ to $+ 5$
$3 {B r}_{2} + 6 N a O H \to 5 N a B r + N a B r O_{3} + 3 H_{2} O$

Oxidation number of bromine changes from 0 in $B r_{2}$ to +5 in $N a B r O_{3}$ .

Oxidation number of bromine in bromate can be calculated with the help of known oxidation state of oxygen (-2) and $N a$ (+1).

Hence, the correct option is $B$ .

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