question_answer 1)

  Which of the carbonates given below is unstable in air and is kept in \[C{{O}_{2}}\] atmosphere to avoid decomposition? (a)\[BeC{{O}_{3}}\]                         (b) \[MgC{{O}_{3}}\]                      (c) \[CaC{{O}_{3}}\]                        (d) \[BaC{{O}_{3}}\]

Answer:

  (a) The instability of\[BeC{{O}_{3}}\]is due to small size of \[B{{e}^{2+}}\]ion which is unable to stabilise the bigger \[CO_{3}^{2-}\]ion.