On adding excess of $N{H_3}$ solution to $CuS{O_4}$ solution, the dark blue colour is due to
${\left[ {Cu{{(N{H_3})}_4}} \right]^{ + 2 }}$
${\left[ {Cu{{(N{H_3})}_2}} \right]^{ + 2 }}$
${\left[ {Cu(N{H_3})} \right]^ + }$
None of the above
Least reactive metal is
Which of the following ions will exhibit colour in aqueous solutions?
The catalytic activity of the transition metals and their compounds is ascribed to their
Which diagram of ionization energy is correct ?