Which of the following statements are correct? (A) The 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 solutions of can liberate hydrogen f

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Solution

Q.
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 solutions of ${Cr}^{2 +}$ can liberate hydrogen from dilute acid.

(D) Magnetic moment of $V^{2 +}$ is observed between 4.4 – 5.2 B.M.

Choose the correct answer from the options given below: [2023]

1 (A), (B) only

2 (C), (D) only

3 (A), (B), (D) only

4 (B), (C) only

Ans.
(4)

(A) $M^{3 +} / M^{2 +}$ reduction potential for manganese is greater than iron.

$E_{{Mn}^{3 +} / {Mn}^{2 +}}^{\circ} = + 1.57 V$

   $E_{{Fe}^{3 +} / {Fe}^{2 +}}^{\circ} = + 0.77 V$

(B)   ${CrO}_{4}^{- 2}, {MnO}_{4}^{-}$

(C)   ${Cr}^{2 +} (aq) + H^{+} (aq) \to {Cr}^{3 +} (aq) + \frac{1}{2} H_{2} ↑$

(D)   $V^{2 +}$ has three unpaired electrons therefore magnetic moment is 3.87 BM.

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