Assertion :Magnesium does not impart characteristic color to the Bunsen burner flame. Reason: Ionisation energy of Mg is very 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.
As Mg has very high ionisation energy it has one more proton in its nucleus to hold on to the electrons in the 3s orbital, so it does not impart any characteristic color to the Bunsen burner flame.

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