Question

On heating which of the following releases ${CO_2}$ most easily ?

• A. ${MgCO3 }$
• B. ${CaCO3 }$
• C. ${K2CO3 }$
• D. ${Na2CO3 }$

Answer 1

Answer: (A)

${MgCO3 }$

Answer 2

The correct option is(A): _M gCO_3

Thermal stability order
${K_2CO_3 > Na_3CO_3 > Ca CO_3 >MgCO_3}$
Therefore ${MgCO_3}$ releases ${CO_2}$ most easily
${MgCO_3 ->[\Delta] MgO + CO_2}$