Which of the following set of elements does not belong to transitional elements set
$Fe,$ $Co,$ $Ni$
$Cu,$ $Ag,$ $Au$
$Ti,$ $Zr,$ $Hf$
$Ga,$ $In,$ $Tl$
Copper displaces which of the metal from their salt solutions
Why does copper not replace hydrogen from acids?
Ionisation enthalpies of $Ce,\,Pr$ and $Nd$ are higher than $Th,\,Pa$ and $U$. Why ?
Horn silver is
In which of the following pairs are both the ions coloured in aqueous solution ?
(At. no. : $Sc = 21, Ti = 22, Ni = 28,$$ Cu = 29, Co = 27$)