Question

Metal carbonates decompose on heating to give metal oxide and carbon dioxide. Which of the metal carbonates is most stable thermally?

• A. $MgCO_{3}$
• B. $CaCO_{3}$
• C. $SrCO_{3}$
• D. $BaCO_{3}$

Answer 1

Answer: (D)

$BaCO_{3}$

Answer 2

: As the electropositive character increases down the group, the stability of the carbonates increases.