A : Salts of $Mg$ does not impart any colour to the flame
R : Due to small size and high effective nuclear charge, ' $Mg$ ' requires a large energy for excitation of electrons.

see full answer

Your Exam Success, Personally Taken Care Of

1:1 expert mentors customize learning to your strength and weaknesses – so you score higher in school , IIT JEE and NEET entrance exams.

An Intiative by Sri Chaitanya

Both A and $R$ are correct and $R$ is the correct explanation of $A$ .

Both $A$ and $R$ are correct but $R$ is not the correct explanation of $A$ .

A is True but $R$ is False.

$R$ is False but $A$ is True

answer is A.

(Unlock A.I Detailed Solution for FREE)

Best Courses for You

JEE

NEET

Foundation JEE

Foundation NEET

CBSE

Detailed Solution

Magnesium possess very high ionization energy because it has one more proton in its nucleus to hold on to the electrons in the 3s orbital, Thus it does not impart any characteristic color to the Bunsen burner flame.

And also, because of the small size of magnesium, it has a high effective nuclear charge, 'Thus, $Mg$ ' requires large energy for the excitation of electrons.

Watch 3-min video & get full concept clarity