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Reaction with Metals

How many mole...

Question

How many molecules of potassium chloride required to balance following chemical reaction:
$C l_{2} + 2 K B r \to K C l (a q) + B r_{2} (g)$

A

1

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B

2

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C

3

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D

5

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Solution

The correct option is D $2$
This reaction shows the displacement mechanism in which chlorine displaces bromine to form potassium chloride. The balanced chemical reaction require 2 molecules of $K C l$ .
$C l_{2} (g) + 2 K B r \to 2 K C l (a q) + B r_{2} (g)$

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C r I_{3}

is treated with

C l_{2}

in basic medium, the following reaction takes place.

C r I_{3} + K O H + C l_{2} \to K_{2} C r_{2} O_{7} + K I O_{4} + K C l + H_{2} O

To produce 81 mols of potassium chloride, how many mols of

C r I_{3}

should be taken?

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