The $3d-$ metal ions are paramagnetic in nature because
They are reducing agents
They form coloured salts
They have one or more paired $ s-$ electrons
They have one or more unpaired $ d-$ electrons
In which pair of ions both are diamagnetic in nature?
Metals generally melt at very high temperature. Amongst the following, the metal with the highest melting point will be $......$
In the first transition series, the highest $B.P. $ and $M.P.$ is of
Which is most reactive metal
Invar, an alloy of $ Fe$ and $ Ni $ is used in watches and meter scale, its characteristic property is