The melting point of $Zn$ is lower compared to those of the other elements of the $3d$ series because $-$

The aqueous solution containing which one of the following ions will be colourless?

Number of paramagnetic ions among the following $d$- and $f$-block metal ions is . . . . . . . $Mn^{2+}$, $Cu^{2+}$, $Zn^{2+}$, $Yb^{2+}$, $Sc^{3+}$, $La^{3+}$, $Gd^{3+}$, $Lu^{3+}$, $Ti^{4+}$, $Ce^{4+}$. (Atomic number of $Mn = 25$, $Cu = 29$, $Zn = 30$, $Yb = 70$, $Sc = 21$, $La = 57$, $Gd = 64$, $Lu = 71$, $Ti = 22$, $Ce = 58$)

Which one of the following properties is not a property of transition elements?

The catalytic activity of transition elements is related to their

Which of the following ionic species will impart colour to an aqueous solution?