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Preparation of Chlorine

BrO3- changes...

Question

$B r O_{3}^{-}$ changes into $B r_{2}$ in an acidic medium of a unbalanced equation. How many electron should be present in the balanced equation?

3 electrons in right

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10 electrons in left

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3 electrons in left

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6 electrons in left

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Solution

The correct option is B 10 electrons in left
The governing chemical reaction is:

$12 H^{+} + 10 e^{-} + 2 B r O_{3}^{-} \to B r_{2} + 6 H_{2} O$

Above reaction shows that 10 electrons are required in left side.
Hence, option (a) is correct.

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