Question

correct order of thermal stability is /are.
a)li3N>na3N>k3N
b)neck>mgcl>cacl2
c)k2co3>na2co3>li2co3
d) Beco3 > mgco3<caco3​

Answer 1

Answer:

These options are wrong.. Correct answer is - K2CO3,MgCO3,CaCO3,BeCO3

Answer 2

Answer:

The correct order of thermal stability are

Li₃N > Na₃N > K₃N

K₂CO₃ > Na₂CO₃ > Li₂CO₃

BeCl₂> MgCl₂ > CaCl₂

Explanation:

The thermal stability is directly proportional to the ionic character.

• As the size of the cation increases, the thermal stability decreases. The order of thermal stability of metal nitrides is as follows.

        Li₃N > Na₃N > K₃N

        BeCl₂> MgCl₂ > CaCl₂

• The alkali metals and alkaline earth metal carbonates decompose on heating to give corresponding oxides with the liberation of carbon dioxide. The thermal stability of these carbonates increases on moving down the group.

        K₂CO₃ > Na₂CO₃ > Li₂CO₃

        BeCO₃ < MgCO₃ < CaCO₃

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