List of top Chemistry Questions on d block elements asked in WBJEE

Which of the following oxides is paramagnetic?

A copper coin was electroplated with Zn and then heated at high temperature until there is a change in colour. What will be the resulting colour ?

The number of unpaired electrons in $Ni$ (atomic number $= 28)$ are

Consider the following salts: $NaCl,\, HgCl_2,\, Hg_2Cl_2,\, CuCl_2,\, CuCl$ and $AgCl$. Identify the correct set of insoluble salts in water

Addition of sodium thiosulphate solution to a solution of silver nitrate gives $X$ as white precipitate, insoluble in water but soluble in excess thiosulphate solution to give $Y$. On boiling in water, $Y$ gives $Z . X, Y$ and $Z$ respectively are

Metal ion responsible for the Minamata disease is

"Electron" is an alloy of

The oxidant which is used as an antiseptic is :