Which of the following carbonates of a metal | vedclass

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(A) Lithium carbonate $Li_{2}CO_{3}$ is the least thermally stable among the given alkali metal carbonates.The thermal stability of alkali metal carbo

Vedclass · Accepted Answer

$Li_{2}CO_{3}$

Vedclass · Answer

(A) Lithium carbonate $Li_{2}CO_{3}$ is the least thermally stable among the given alkali metal carbonates.The thermal stability of alkali metal carbonates increases as we move down the group from $Li$ to $Cs$ because the ionic character increases and the polarizing power of the metal cation decreases.Due to the very small size of the $Li^{+}$ ion,it has a high polarizing power. It distorts the electron cloud of the large carbonate ion $(CO_{3}^{2-})$,which weakens the $C-O$ bond and strengthens the $Li-O$ bond,facilitating the decomposition into oxide and carbon dioxide.The decomposition reaction is: $Li_{2}CO_{3} \xrightarrow{\Delta} Li_{2}O + CO_{2}$

Column $-I$	Column $-II$
$(a)$ Borax	$(p)$ $NaCl$
$(b)$ Carnallite	$(q)$ $KCl$
$(c)$ Rock salt	$(r)$ $KCl.MgCl_2.6H_2O$
$(d)$ Silvine	$(s)$ $Na_2B_4O_7.10H_2O$

Which of the following carbonates of a metal has least thermal stability?

Similar Questions

Match column $-I$ with column $-II$ :

Column $-I$ Column $-II$

$(a)$ Borax $(p)$ $NaCl$

$(b)$ Carnallite $(q)$ $KCl$

$(c)$ Rock salt $(r)$ $KCl.MgCl_2.6H_2O$

$(d)$ Silvine $(s)$ $Na_2B_4O_7.10H_2O$

Which of the following statements is not correct?

Which of the following statements is correct for a highly pure dilute solution of sodium in liquid ammonia?

The element with atomic number $55$ belongs to which block of the periodic table?

Assertion : Lithium carbonate is not so stable to heat.
Reason : Lithium being very small in size polarizes large $CO_3^{2-}$ ion leading to the formation of more stable $Li_2O$ and $CO_2$.

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