Which of the following statements concern with transition metals ?
compounds containing ions of transition elements are usually coloured
the most common oxidation state is $+3$
they easily form complexes
All of the above
Which of the following compounds is not coloured ?
The colour of copper sulphide is
Steel differs from pig iron and wrought iron in that it contains
Chloro compound of vanadium has only spin magnetic moment of $1.73\,BM$ . This vanadium chloride has the formula :- (at no. of $V = 23$ )
Among $\mathrm{CrO}, \mathrm{Cr}_2 \mathrm{O}_3$ and $\mathrm{CrO}_3$, the sum of spin-only magnetic moment values of basic and amphoteric oxides is . . . . . . . . $10^{-2} \mathrm{BM}$ (nearest integer).
(Given atomic number of $\mathrm{Cr}$ is 24 )