1 gm of a mixture of CaCO_3 and MgCO_3 gave on ignition 240 ml of CO_2 at STP. What is the percentage composition of the mixture? (1) % CaCO_3=63.25 (2) % MgCO_3=75.21 (3) % CaCO_3=36.75 (4) % MgCO_3=36.75

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