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Law of Reciprocal Proportions

KI contains ...

Question

$K I$ contains $23.6$ % potassium, $K C l$ contains $52$ % potassium then $I C l$ contains ______% of iodine.

A

77.8

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B

68.9

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C

72.9

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D

75.1

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Solution

The correct option is A $77.8$
% of Iodine:

$= \frac{M o l W t . o f I}{M o l W t o f I + M o l W t . o f C l} \times 100$

$= \frac{126.9}{126.9 + 35.5} \times 100 = 77.7$

Hence, the correct option is $A$

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