When an acidified solution of ferrous ammonium sulphate it treated with potassium permanganate solution, the ion which is oxidised is
$Mn{O_4}$
$NH_4^ + $
$F{e^{ + 2 }}$
$SO_4^{2 - }$
Which one of the following metals will not reduce ${H_2}O$
Copper displaces which of the metal from their salt solutions
Which is not amphoteric
Which pair of compound is expected to show similar colour in aqueous medium
Transition metals are not characterized by