The electronic configuration of $Cr^{3+}$ is

Which cation from the following exhibits no magnetic moment?

The most stable oxidation state of $Cr$ in aqueous medium is

Given below are two statements: one is labelled as Assertion $(A)$ and the other is labelled as Reason $(R)$.
Assertion $(A):$ $Cu^{2+}$ in water is more stable than $Cu^{+}$.
Reason $(R):$ Enthalpy of hydration for $Cu^{2+}$ is much less than that of $Cu^{+}$.
In the light of the above statements,choose the correct answer from the options given below:

Which of the following paramagnetic ions would exhibit a magnetic moment (spin only) of the order of $5 \ BM$?
(At. Nos. $Mn = 25$,$Cr = 24$,$V = 23$,$Ti = 22$)

The divalent ion of which of the following elements in an aqueous solution has a magnetic moment of $5.92 \ BM$?