Question 47 of 137

A sample of CaCO₃ is 50% pure. On heating 1.12 litres of CO₂ (at NTP) is obtained. Residues left (assuming non-volatile impurity) is (Ca = 40, C= 12, O=16)

1. 7.8gm

2. 5 gm

3. 3.8 gm

4. 2.8 gm