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3.2 g of a mixture of calcium carbonate ...

3.2 g of a mixture of calcium carbonate and sodium chloride was dissolved in 100 mL of 1.02 N HCl. After the reaction the solution was filtered and after separating the precipitate the volume was raised to 200 mL . 20 mL of this solution required `25 mL N//5` caustic soda solution for neutralisation. Find out the percentage of calcium carbonate in the mixture.

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The correct Answer is:
0.8125
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