Which of the following statements are correct?
(A) The M3+/M2+ reduction potential for iron is greater than manganese
(B) The higher oxidation states of first row dblock elements get stabilized by oxide ion.
(C) Aqueous solution of Cr2+ can liberate hydrogen from dilute acid.
(D) Magnetic moment of V2+ is observed between 4.4-5.2 BM Choose the correct answer from the options given below:
(A) The M3+/M2+ reduction potential for iron is greater than manganese
(B) The higher oxidation states of first row dblock elements get stabilized by oxide ion.
(C) Aqueous solution of Cr2+ can liberate hydrogen from dilute acid.
(D) Magnetic moment of V2+ is observed between 4.4-5.2 BM Choose the correct answer from the options given below:
Show Hint
Review concepts of reduction potentials, stability of oxidation states in d-block elements, and the relationship between unpaired electrons and magnetic moment
- (A), (B) only
- (B), (C) only
- (C), (D) only
- (A), (B), (D) only
The Correct Option is B
Solution and Explanation
(A) Incorrect:
The reduction potential for the M3+/M2+ couple for manganese is greater than that for iron:
\[ E^\circ_{\text{Mn}^{3+}/\text{Mn}^{2+}} = +1.57 \, \text{V}, \, E^\circ_{\text{Fe}^{3+}/\text{Fe}^{2+}} = +0.77 \, \text{V} \]
Therefore, this statement is incorrect.
(B) Correct:
Higher oxidation states of first-row d-block elements are stabilized by oxide ions (O2−) due to the formation of strong metal-oxygen bonds. This statement is correct.
(C) Correct:
Chromium in the Cr2+ oxidation state can reduce H+ to H2 in aqueous solution:
\[ \text{Cr}^{2+} + \text{H}^+ \rightarrow \text{Cr}^{3+} + \frac{1}{2}\text{H}_2 \]
The reduction potential \( E^\circ_{\text{Cr}^{3+}/\text{Cr}^{2+}} = -0.26 \, \text{V} \) confirms this. This statement is correct.
(D) Incorrect:
V2+ has three unpaired electrons, resulting in a magnetic moment of approximately 3.87 BM, which is not within the range of 4.4-5.2 BM. This statement is incorrect.
Conclusion:
- (A) Incorrect
- (B) Correct
- (C) Correct
- (D) Incorrect
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