Which of the following has the lowest thermal | vedclass

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(A) Alkali metal carbonates are generally stable to heat,except for $Li_2CO_3$.As we move down the group,the electropositive character of the alkali m

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$Li_2CO_3$

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(A) Alkali metal carbonates are generally stable to heat,except for $Li_2CO_3$.As we move down the group,the electropositive character of the alkali metals increases,which leads to an increase in the thermal stability of their carbonates.The order of thermal stability is: $Li_2CO_3 $Li_2CO_3$ is the least stable because $Li^+$ has a high polarizing power due to its small size,which weakens the $C-O$ bond in the carbonate ion,leading to decomposition upon heating: $Li_2CO_3 \rightarrow Li_2O + CO_2$.

List-$I$ (Alkali Metal)	List-$II$ (Emission Wavelength in $nm$)
$A$. $Li$	$I$. $589.2$
$B$. $Na$	$II$. $455.5$
$C$. $Rb$	$III$. $670.8$
$D$. $Cs$	$IV$. $780.0$

Which of the following has the lowest thermal stability?

Similar Questions

Match List-$I$ with List-$II$.

List-$I$ (Alkali Metal) List-$II$ (Emission Wavelength in $nm$)

$A$. $Li$ $I$. $589.2$

$B$. $Na$ $II$. $455.5$

$C$. $Rb$ $III$. $670.8$

$D$. $Cs$ $IV$. $780.0$

Choose the correct answer from the options given below:

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