Q. Which one of the following order of stability is correct?
A) $MgCO_{3} > CaCO_{3} > SrCO_{3} > BaCO_{3}$
B) $BaCO_{3} > SrCO_{3} > CaCO_{3} > MgCO_{3}$
C) $MgCO_{3} > BaCO_{3} > SrCO_{3} > CaCO_{3}$
D) $CaCO_{3} > BaCO_{3} > MgCO_{3} > SrCO_{3}$
Explanation
(b)
In II-A group, the stability of carbonates increase with the rise in atomic number due to small size of the resulting oxide ion.
i.e.,
$BeCO_{3} < MgCO_{3} < CaCO_{3} < SrCO_{3} < BaCO_{3}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.