Q. Pick out the statement (s) which is (are) not true about the diagonal relationship of Li and Mg. (i) Polarising powers of $Li^{+}\ and\ {Mg}^{2 +}$ are almost same. (ii) L like Li, Mg decomposes water very fast. (iii) $LiCl\ and\ {MgCl}_{2}$ are deliquescent. (iv) Like Li, Mg does not form solid bicarbonates.
A) (i) and (ii)
B) (ii) and (iii)
C) Only (ii)
D) Only (i)
Explanation
(c)
Lithium and magnesium shows diagonal relationship. Some points of similarity are
(i) Polarising power of $Li^{+}\ and\ Mg^{+}$ are almost same.
(ii) Like Li, Mg decomposes water very slowly.
(iii) LiCl and $MgCl_{2}$ are deliquescent.
(iv) Like Li, Mg do not form solid bicarbonates.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.