Number of unpaired electrons in $M{n^{2 + }}$ is

Manganese steel is used for making railway tracks because

If spin only magnetic moment of $VCl_X$ is $1.73\,BM$ then correct formula is

Cuprous ion is colourless, while cupric ion is coloured because

Essential constituent of an amalgam is

Explain giving reasons:

$(i)$ Transition metals and many of their compounds show paramagnetic behaviour.

$(ii)$ The enthalpies of atomisation of the transition metals are high.

$(iii)$ The transition metals generally form coloured compounds.

$(iv)$ Transition metals and their many compounds act as good catalyst.