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20 gm of a chalk sample is dissolved com...

20 gm of a chalk sample is dissolved completely in excess of dilute HCl solutions. If `3.36 L CO_(2)` gas is produced at 273 K and 1 atm, the percentage of pure `CaCO_(3)` in chalk is (assume that the impurities are inert to HCl and `CO_(2)` is completely insoluble in water)

A

0.25

B

0.5

C

0.75

D

0.8

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