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Q.

Which one of the following correctly represent the increasing order of thermal stability of carbonates ?

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a

BeCO3  <  MgCO3  <  CaCO3  <  SrCO3  <  BaCO3

b

BeCO3  <  MgCO3  ≈  CaCO3  <  SrCO3  <  BaCO3

c

BeCO3  <  MgCO3  >  CaCO3  >  SrCO3  >  BaCO3

d

BeCO3  >  MgCO3  ≈  CaCO3  <  SrCO3  <  BaCO3

answer is A.

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Detailed Solution

The oxide of the smaller cation will be much more stable than those of large cations. The carbonates of smaller cation will therefore decompose to their oxides more easily than those of the larger cations.
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