Assertion :Be and Mg do not impart characteristic colour to the flame. Reason: Both Be and Mg have high ionization energy.

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
$B e$ and $M g$ do not impart characteristic colour to the flame as they both are small in size and also the attraction between the outermost valence shell electron and the nucleus is high due to which they have high ionization enthalpy, thus exciting of electron becomes hard.

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