A) because their d-orbitals are complete.
B) because they have mostly paired electrons.
C) because they have mostly unpaired electrons.
D) because they form coloured ions.
Correct Answer: C
Solution :
All atomic and molecular species which contain one or more unpaired electrons are paramagnetic Most of the ions of transition elements have unpaired electrons. Hence they are all paramagnetic. Some ions of d - block elements with no unpaired electrons are \[S{{c}^{+3}},T{{i}^{+4}},Z{{n}^{+2}}\]and\[C{{u}^{+1}}\]. These ions are not paramagnetic and they are also without colour.
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