91Ó°ÊÓ

Which of the following ion have the same number of unpaired electrons as in \(\mathrm{Fe}^{2+}\) \((Z=26) ?\) (a) \(\mathrm{Fe}^{3+}(Z=26)\) (b) \(\mathrm{Ni}^{2+}(Z=28)\) (c) \(\mathrm{Co}^{3+}(Z=27)\) (d) \(\operatorname{Cr}^{+}(Z=24)\)

Which of the following will have magnetic moment, about 4.9 B.M.? (a) \(\mathrm{Cr}^{+}(Z=24)\) (b) \(\mathrm{Ti}^{*+}(Z=22)\) (c) \(\mathrm{Fe}^{2+}(Z=26)\) (d) \(\mathrm{Cu}^{2+}(Z=29)\)

Which of the following ion is diamagnetic? (a) \(\mathrm{Sc}^{3+}(Z=21)\) (b) \(\mathrm{Ti}^{2+}(Z=22)\) (c) \(\mathrm{V}^{3+}(Z=23)\) (d) \(\mathrm{Fe}^{2+}(Z=26)\)

Which of the following ion will have maximum magnetic moment? (a) \(\mathrm{Fe}^{3+}(Z=26)\) (b) \(\mathrm{Cr}^{3+}(Z=24)\) (c) \(\mathrm{Ti}^{4+}(Z=22)\) (d) \(\mathrm{Co}^{3+}(Z=27)\)

For which of the following element, all of its existing ion, \(\mathbf{M}^{\mathrm{x}+}\), will be diamagnetic? (a) \(\mathrm{Cu}\) (b) \(\mathrm{Fe}\) (c) \(\mathrm{Cr}\) (d) \(\mathrm{Na}\)

The magnetic moment of \(\mathrm{Ni}^{\mathrm{x}+}\) ion \((Z=28)\) is about \(2.82 \mathrm{~B} . \mathrm{M} .\) The value of \(x\) is (a) 2 (b) 4 (c) 1 (d) 3

A compound of vanadium has a magnetic moment of \(1.73 \mathrm{BM}\). The electronic configuration of vanadium ion in the compound is (a) \([\mathrm{Ar}] 3 \mathrm{~d}^{2}\) (b) \([\mathrm{Ar}] 3 \mathrm{~d}^{1}\) (c) \([\mathrm{Ar}] 3 \mathrm{~d}^{3}\) (d) [Ar]4s

. Which of the following is paramagnetic? (a) \(\mathrm{Zn}^{2+}(Z=30)\) (b) \(\mathrm{Ni}^{2+}(Z=28)\) (c) \(\mathrm{Sc}^{3+}(Z=21)\) (d) \(\mathrm{O}^{2-}(Z=8)\)

Which of the following ion is expected to be colourless? (a) \(\mathrm{Ni}^{2+}(Z=28)\) (b) \(\mathrm{Mn}^{2+}(Z=25)\) (c) \(\mathrm{Zn}^{2+}(Z=30)\) (d) \(\mathrm{Cu}^{2+}(Z=29)\)