Colour of the solution when $K I$ reacts with $B r_{2}$ is:

pale yellow

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reddish-brown

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black

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none of the above

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Solution

The correct option is D pale yellow
They undergo a displacement reaction where a more reactive halogen in this case bromine displaces iodine from its salt.

${B r}_{2_{(l)}} + {2 K I}_{(a q)} \to {2 K B r}_{(a q)} + I_{2}$

In this reaction, the solution will have a slight change in colour to a different shade of brown since the bromine and iodine solution are both in a different shade of brown. Since it's reddish-brown.

Hence, option B is correct.

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Colour of the solution when KI reacts with Br2 is:

Colour of the solution when $K I$ reacts with $B r_{2}$ is: