Assertion :Alkaline earth metal oxides are quite stable to heat. Reason: Enthalpies of formation of alkaline earth metal oxides are quite high.

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 correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
The oxides of alkaline earth metals are formed by heating metal in dioxygen or by thermal decomposition of their carbonates.
$2 M + O_{2} \to 2 M O$ ( $M = B e, M g, C a$ )
$M C O_{3} \to M O + C O_{2}$ ( $M = B e, M g, C a$ )
The oxides are stable to heat as their enthalpy of formation is quite high.

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