${\rm{FeS}}{{\rm{O}}_4}.{\left( {{\rm{N}}{{\rm{H}}_4}} \right)_2}{\rm{\;S}}{{\rm{O}}_4}.6{{\rm{H}}_2}{\rm{O}}$ is called

Pick out the correct statements from the following.

I. Cobalt (III) is more stable in octahedral complexes.

II. Zinc forms coloured ions or complexes.

III. Most of the $d$-block elements and their compounds are ferromagnetic.

IV. Osmium shows (VIII) oxidation state.

V. Cobalt (II) is more stable in octahedral complexes.

Which is not correct for transition metals?

The colour of $_{62}{\rm{S}}{{\rm{m}}^{3 + }}$ is yellow. The expected colour of ${{\rm{\;}}_{66}}{\rm{D}}{{\rm{y}}^{3 + }}$ is

Which of the following ions has the highest magnetic moment?

Transition metals in their compounds show:

Transition metal with low oxidation number will act as

Amongst ${\rm{TiF}}_6^{2 - }$ , ${\rm{CoF}}_6^{3 - }$, ${\rm{C}}{{\rm{u}}_2}{\rm{C}}{{\rm{l}}_2}$ and ${\rm{NiCl}}_4^{2 - }$

(atomic no Ti=22, Co=27, Cu=29,Ni=28) the colourless species are

Blue vitriol is:

Ferrous sulphate on heating gives:

Which metal does not form amalgam?