Alkaline earth metal(s) which does (do) not impart colour to the flame is (are):

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Solution

The correct options are
A Be
B Mg
Beryllium(Be) and Magnesium(Mg) can not give flame test. These have small size and strongly bind their electrons. Thus, these have high ionization enthalpies and the thermal energy of flame is not sufficient to excite their electrons.

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The alkaline earth metals which do not give colour to flame is:

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