JEE PYQ: Atomic Structure Question 2
Question 2 - 2021 (16 Mar Shift 2)
Arrange the following metal complex/compounds in the increasing order of spin only magnetic moment. Presume all the three, high spin system. (Atomic numbers: Ce = 58, Gd = 64 and Eu = 63.)
(a) $(NH_4)_2[Ce(NO_3)_6]$ (b) $Gd(NO_3)_3$ and (c) $Eu(NO_3)_3$
(1). ((b) < (a) < (c))
(2). ((c) < (a) < (b))
(3). ((a) < (b) < (c))
(4). ((a) < (c) < (b))
Show Answer
Answer: (4)
Solution
Ce$^{4+}$: 0 unpaired e$^-$, $\mu = 0$. Eu$^{3+}$: 6 unpaired, $\mu = \sqrt{48}$. Gd$^{3+}$: 7 unpaired, $\mu = \sqrt{63}$. Order: a < c < b.
BETA
