(A) .Among the $s$-block elements,$Be$ and $Mg$ salts do not impart any characteristic color to the flame because the excitation energy required to pr

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(A) .Among the $s$-block elements,$Be$ and $Mg$ salts do not impart any characteristic color to the flame because the excitation energy required to promote electrons to higher energy levels is very high,which cannot be provided by the heat of a Bunsen burner.