A sample of mixture of CaCl2 and NaCl weighing 5.55 g was treated to precipitate all the Ca as CaCO3 which was then heated and quantitatively converted to 1.68 g of CaO. The mass percentage of CaCl2 in the mixture is;
A
60%
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B
70%
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C
45%
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D
56%
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Solution
The correct option is D60% Ca present in 1.68 g CaO is 1.2 g. So, original mixture has 1.2 g Ca means 1.2×11140=3.33 g CaCl2.