Chemistry - Chemical Equilibrium Question with Solution | TestHub

Solid ${\mathrm{CaCO}}_3(\mathrm{s})$ is taken in a closed vessel and is heated until the system attains the following equilibrium:

${\mathrm{CaCO}}_3(\mathrm{s})\rightleftharpoons \mathrm{CaO}(\mathrm{s})+{\mathrm{CO}}_2(\mathrm{g})$

At equilibrium, sufficient ${\mathrm{MgCO}}_3(\mathrm{s})$ is added at the same temperature, which decomposes to attain the equilibrium:

${\mathrm{MgCO}}_3(\mathrm{s})\rightleftharpoons \mathrm{MgO}(\mathrm{s})+{\mathrm{CO}}_2(\mathrm{g})$

Which of the following graphs correctly illustrates the variation of masses of ${\mathrm{CO}}_2(\mathrm{g})$ and $\mathrm{CaO}(\mathrm{s})$ with time?