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Q.

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

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a

I is false and II is true

b

Both the statements are true

c

I is true and II is false

d

Both the statements are false

answer is A.

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Detailed Solution

large L{i_2}C{O_3};xrightarrow{{;;Delta ;;}};L{i_2}O; + ;C{O_2}

stability of I_A group carbonates :

large xrightarrow{{L{i_2}C{O_3}; < ;N{a_2}C{O_3}; < ;{K_2}C{O_3}; < ;R{b_2}C{O_3}; < ;C{s_2}C{O_3};;}}

Stability of carbonates increases
Reason: A larger size cation will stabilize the large size anion and hence Cs₂CO₃ is more stable and Li₂CO₃ is least stable
→ Li₂CO₃ → 2Li⁺ + CO₃^-2

II) 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.

large CO_3^{ - 2}; + ;2{H_2}O; to ;{H_2}C{O_3}; + ;Omathop Hlimits^ ominus

During the hydrolysis of CO₃^-2ion, OH^- ion releases into the solution
→ Therefore the solution exhibits alkaline nature

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