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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 d-block 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: (1) (B), (C) only (2) (A), (B), (D) only (3) (C), (D) only (4) (A), (B), only

1. (B), (C) only
2. (A), (B), (D) only
3. (C), (D) only
4. (A), (B), only

Correct answer: (B), (C) only

Solution

Options (B) and (C) are correct because higher oxidation states of first row d-block elements are indeed stabilized by oxide ions, and Cr2+ can reduce protons in dilute acid to liberate hydrogen gas.

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