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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