NEET-XII-Chemistry
Previous Year Paper year:2018
- #87Match the metal ions given in Column I with the spin
magnetic moments of the ions given in Column II
and assign the correct code :
Column I Column II
a.`` Co^{3+}`` i. ``\sqrt8`` B.M.
b. ``Cr^{3+}`` ii. ``\sqrt35`` B.M.
c. ``Fe^{3+}`` iii. ``\sqrt3`` B.M.
d. ``Ni^{2+}`` iv. ``\sqrt24`` B.M.
v. ``\sqrt24`` B.M.
a b c d
(1) iv v ii i
(2) i ii iii iv
(3) iv i ii iii
(4) iii v i iidigAnsr: 1Ans : (1)
17
CODE - PP
Sol. Magnetic moment () = +n n 2 B.M.
(a) Co3+ 1s2 2s2 2p6 3s2 3p6 4s0 3d6
n = 4
= + =4 4 2 24 B. M
(b) Cr+3 1s2 2s2 2p6 3s2 3p6 4s0 3d3
n = 3
= + =3 3 2 15 B.M.
(c) Fe3+ 1s2 2s2 2p6 3s2 3p6 4s0 3d5
n = 5
= + =5 5 2 35 B. M.
(d) Ni+2 1s2 2s2 2p6 3s2 3p6 4s0 3d8
n = 2
= + =2 2 2 8 B. M.