Which of the following statements are correct? (A) The M 3 + / M 2 + reduction potential for iron is greater than manganese. (B) The higher oxidation states of first row d-block elements get stabilized by oxide ion (C) Aqueous solution of Cr 2 + can liberate hydrogen from dilute acid (D) Magnetic moment of V 2 + is observed between 4 . 4 - 5 . 2 BM Choose the correct answer from the options given below:

Step-by-step solution

The valence electronic configuration of Mn 3 + is 3 d 4 and that of Mn 2 + is stable 3 d 5 .The valence electronic configuration of Fe 3 + is 3 d 5 and that of Fe 2 + is 3 d 6 . The reduction electrode potential of Mn 3 + / Mn 2 + is + 1 . 57 V while that of Fe 3 + / Fe 2 + is + 0 . 77 V , hence A is wrong. Higher oxidation state of smaller d -block elements is stabilised (or say form compounds) with smaller anion oxide that can be explained by stearic reason hence B is correct. The oxidation electrode potential of