Which of the following compounds is colourless?

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

Assertion: In general,transition metals have high melting points.
Reason: More number of electrons from $(n-1)d$ and $ns$ are involved in interatomic metallic bonding.
The correct option among the following is

Which of the following statements is not true?

Cuprous ion is colourless,while cupric ion is coloured because

The spin only magnetic moments (in $BM$) for free $Ti^{3+}, V^{2+}$ and $Sc^{3+}$ ions respectively are (At.No. $Sc: 21; Ti: 22; V: 23$)