The correct order of increasing thermal stability of K _2 CO _3, MgCO _3, CaCO _3 and BeCO _3 is :

NEET 2007 Chemistry question

Not in JEE Main or NEET syllabus

The correct order of increasing thermal stability of , , and is :

(1)
(2)
(3)Correct
(4)

Answer: (3)

Solution

The thermal stability of carbonates depends on the polarising power of the cation. Small, highly charged polarises the carbonate ion most and decomposes at a very low temperature; stability increases down group 2 as the cation size increases ($BeCO_3 < MgCO_3 <

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Question ID VK-089859