Question

With reference to the first row transition series :
i) Name the metal which possesses maximum number of oxidation states.
ii) Among $Z{n}^{+2}$ and $C{u}^{+2}$ which is colourless?
iii) Between $T{i}^2+$ and $V^{2+}$ which ion contains more number of unpaired electrons?

Answer 1

i) The metal which possesses maximum number of oxidation states are Cr (+1,+2,+3,+4,+5,+6) and Mn(+2,+3,+4,+5,+6,+7)
ii) $Z{n}^{2+}$ with 0 unpaired electrons is colourless. $C{u}^{2+}$ with 1 unpaired electron is blue.
iii) $T{i}^{2+}$ has 2 unpaired electrons. $V^{2+}$ has 3 unpaired electrons.
Hence, $V^{2+}$ on contains more number of unpaired electrons.