Find the value of spin-only magnetic moment for chromium cation in $+2$ state. (in $BM$)

The highest magnetic moment is shown by the transition metal ion with the outer electronic configuration

Ferrous ion changes to $X$ ion upon reacting with acidified hydrogen peroxide. The number of $d$-electrons present in $X$ and its magnetic moment (in $BM$) are,respectively:

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

The correct statement$(s)$ about transition elements is/are:

Cuprous ion is colourless while cupric ion is coloured because