$d$-block elements form alloys easily because......

Identify the correct statements from the following: $(i)$ $Ti(IV)$ is more stable than $Ti(III)$ and $Ti(II)$ $(ii)$ Among $3d-$series elements (from $Z=22$ to $29$) only copper has positive reduction potential $(M^{2+} / M)$ $(iii)$ Both $Sc$ and $Zn$ exhibit $+1$ oxidation state

Which of the following ions are diamagnetic?

What is the number of unpaired electrons in $Ti$ in $+3$ state?

The correct order of ionic radii of $Y^{3+}$,$La^{3+}$,$Eu^{3+}$ and $Lu^{3+}$ is
(Atomic No. $Y = 39$,$La = 57$,$Eu = 63$,$Lu = 71$)

Which of the following alloys contain only $Cu$ and $Zn$?