Statement I : Li2CO3 decomposes on heating to give CO2 gasStatement II : Carbonates of alkali metals give weakly alkaline solutions due to the hydrolysis of carbonate ion

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Both the statements are true

Both the statements are false

I is false and II is true

I is true and II is false

answer is A.

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Detailed Solution

I) stability of IA group carbonates : Stability of carbonates increasesReason: A larger size cation will stabilize the large size anion and hence Cs2CO3 is more stable and Li2CO3 is least stable→ Li2CO3 → 2Li+ + CO3-2II) Anion of strong acid and cation of strong base can't undergo hydrolysis, but anion of W.A & cation of W.B can undergo hydrolysis .CO3-2 is the anion of weak acid [H2CO3], therefore it can undergo hydrolysis. During the hydrolysis of CO3-2 ion, OH- ion releases into the solution→ Therefore the solution exhibits alkaline nature

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