Which one of the following on heating will no | vedclass

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(B) Most metal carbonates decompose on heating to give the corresponding metal oxide and $CO_2$ gas. $CaCO_3 \xrightarrow{\Delta} CaO + CO_2$ $PbCO_3

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$Na_2CO_3$

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(B) Most metal carbonates decompose on heating to give the corresponding metal oxide and $CO_2$ gas. $CaCO_3 \xrightarrow{\Delta} CaO + CO_2$ $PbCO_3 \xrightarrow{\Delta} PbO + CO_2$ $Li_2CO_3 \xrightarrow{\Delta} Li_2O + CO_2$ However,alkali metal carbonates (except $Li_2CO_3$) are thermally stable and do not decompose on heating. $Na_2CO_3$ does not decompose on heating because the lattice energy of $Na_2CO_3$ is very high,making it thermally stable.

List-$I$ (Salt)	List-$II$ (Flame colour wavelength)
$(a)$ $LiCl$	$(i)$ $455.5 \text{ nm}$
$(b)$ $NaCl$	$(ii)$ $670.8 \text{ nm}$
$(c)$ $RbCl$	$(iii)$ $780.0 \text{ nm}$
$(d)$ $CsCl$	$(iv)$ $589.2 \text{ nm}$

Which one of the following on heating will not give $CO_2$?

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Match List-$I$ with List-$II$:

List-$I$ (Salt) List-$II$ (Flame colour wavelength)

$(a)$ $LiCl$ $(i)$ $455.5 \text{ nm}$

$(b)$ $NaCl$ $(ii)$ $670.8 \text{ nm}$

$(c)$ $RbCl$ $(iii)$ $780.0 \text{ nm}$

$(d)$ $CsCl$ $(iv)$ $589.2 \text{ nm}$

Choose the correct answer from the options given below:

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