Assertion :Both $L i_{2} C O_{3}$ and $N a_{2} C O_{3}$ will turn lime water milky on heating. Reason: $L i_{2} C O_{3}$ on heating gives $L i_{2} O$ and $C O_{2}$ on heating.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is incorrect but Reason is correct

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Both Assertion and Reason are incorrect

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Solution

The correct option is C Assertion is incorrect but Reason is correct
Carbonates of $L i$ and $M g$ decompose on heating and liberate $C O_{2}$ . Carbonates of other alkali metals are stable towards heat and decomposed only on fusion.
$L i_{2} C O_{3} ⟶ L i_{2} O + C O_{2}$ ; $M g C O_{3} ⟶ M g O + C O_{2}$

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Assertion :Both Li2CO3 and Na2CO3 will turn lime water milky on heating. Reason: Li2CO3 on heating gives Li2O and CO2 on heating.

The correct option is C Assertion is incorrect but Reason is correctCarbonates of Li and Mg decompose on heating and liberate CO2. Carbonates of other alkali metals are stable towards heat and decomposed only on fusion. Li2CO3⟶Li2O+CO2 ; MgCO3⟶MgO+CO2

Assertion :Both $L i_{2} C O_{3}$ and $N a_{2} C O_{3}$ will turn lime water milky on heating. Reason: $L i_{2} C O_{3}$ on heating gives $L i_{2} O$ and $C O_{2}$ on heating.