The correct statement in respect of $d-$ block elements
They are all metals
They show variable valency
They form coloured ions and complex salts
All above statements are correct
Which of the following compounds is metallic and ferromagnetic ?
Permanent magnet is made from
Which of the following will show increase in weight when kept in magnetic field
Least reactive metal is
The purple colour of $KMnO_4$ is due to the transition