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Question

Chemistry Question on GROUP 2 ELEMENTS

The correct order of increasing thermal stability of K2CO3,MgCO3,CaCO3K_2CO_3, MgCO_3, CaCO_3 and BeCO3 BeCO_3 is

A

BeCO3<MgCO3<K2CO3<CaCO3BeCO_3 < MgCO_3 < K_2CO_3 < CaCO_3

B

BeCO3<MgCO3<CaCO3<K2CO3BeCO_3 < MgCO_3 < CaCO_3 < K_2CO_3

C

MgCO3<BeCO3<CaCO3<K2CO3MgCO_3 < BeCO_3 < CaCO_3 < K_2CO_3

D

K2CO3<MgCO3<CaCO3<BeCO3K_2CO_3 < MgCO_3 < CaCO_3 < BeCO_3

Answer

BeCO3<MgCO3<CaCO3<K2CO3BeCO_3 < MgCO_3 < CaCO_3 < K_2CO_3

Explanation

Solution

Thermal stability of carbonates increases in a group as we move from top to bottom and decreases in a period as we move from left to right, so the correct order of thermal stability of given carbonates
is
BeCO3<MgCO3<CaCO3<K2CO3BeCO_3 < MgCO_3 < CaCO_3 < K_2CO_3
Be,MgBe, Mg and CaCa are present in second group and KK is present in first group