Which of the following statements are correct?

A) Magnetic moment of  $M{n}^{+2}$  is observed between  $1.73-4.90BM$

B) The  $M^{3+}/M^{2+}$ reduction potential for iron is greater than manganese

C) The higher Oxidation states of first row d-block elements get stabilized by oxide ion

D) Aqueous solution of  $C{r}^{+2}$  can liberate hydrogen from dilute acid.

Choose the correct answer