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B
1 mole of MgCO3 gave 40.0gMgO.
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C
1 mole of NaHCO3 gave 4gH2O.
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D
1 mole of Ca(HCO3)2 gave 1 mole CO2.
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Solution
The correct option is C1 mole of MgCO3 gave 40.0gMgO. Assuming all are 100% pure, then, 1 mole of CaCO3 should give 22.4 L CO2 (at STP). 1 mole of MgCO3 should give 40.0 g MgO. 1 mole of NaHCO3 should give 9 g H2O. 1 mole of Ca(HCO3)2 should give 2 mol CO2.