The metal ion which does not form coloured compound is
Chromium
Manganese
Zinc
Iron
The catalytic activity of transition metals and their compounds is ascribed mainly to
Number of unpaired electrons in $M{n^{2 + }}$ is
If spin only magnetic moment of $VCl_X$ is $1.73\,BM$ then correct formula is
Permanent magnet is made from
The melting point of $Zn$ is lower as compared to those of the other elements of $3d$ series because