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Question

Common salt obtained from Clifton beach contained 60.75% chlorine while 6.40 g of a sample of common salt from Khewra mine contained 3.888 g of chlorine. State the law illustrated by these chemical combinations.

A
Law of reciprocal proportion
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B
Law of multiple proportion
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C
Law of constant composition
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D
None of the above
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Solution

The correct option is A Law of constant composition
First case :

Common salt from Clifton beach contains = 60.75% Cl2

100 g of salt =60.75 g of Cl2

1 g of salt =60.75100=0.6075 g of Cl2
Second case :

6.40 g of NaCl from Khewra mine =3.888 g of Cl2

1 g of NaCl from Khewra mine =3.8886.40=0.6075 g of Cl2
Thus, the weight of Cl2 in 1 g of salt in both the cases is same. Hence, the law of constant composition is verified.

Hence the correct option is C.

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