The aqueous solution containing which one of the following ions will be colourless
$S{c^{3 + }}$
$F{e^{2 + }}$
$T{i^{3 + }}$
$M{n^{2 + }}$ (Atomic number $Sc = 21,\, Fe = 26, \,Ti = 22, \,Mn = 25)$
Which of the following have highest melting point
Ionisation potential values of $d-$ block elements as compared to ionization potential value of $ f-$ block elements are
By annealing, steel
Which one of the following does not correctly represent the order of property indicated against it
Solder is an alloy of