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COMEDK2024Morning ShiftChemistryd and f Block ElementsActual

Choose the incorrect statement from the following

Options

  1. ACu (I) compounds in aqueous medium undergo disproportionation reaction
  2. BMoO ₃ and WO ₃ are not as strong oxidants as CrO ₃
  3. CThe ability of Fluorine to stabilise the higher oxidation states of transition metals exceeds that of Oxygen
  4. DCr ²⁺ is a stronger reducing agent than Fe ²⁺

Correct answer

C. The ability of Fluorine to stabilise the higher oxidation states of transition metals exceeds that of Oxygen

Step-by-step solution

(1) Correct: Cu^+ is unstable in aqueous medium due to the much higher hydration energy of Cu²⁺ . It undergoes disproportionation: 2Cu^+(aq) Cu²⁺(aq) + Cu(s) . (2) Correct: Oxidising power decreases down Group 6. CrO₃ is a strong oxidant while MoO₃ and WO₃ are much weaker. (3) Incorrect: Oxygen can stabilise higher oxidation states through multiple bonding (e.g., in oxoanions like MnO₄^- , CrO₄²⁻ ). The ability of oxygen to stabilise higher oxidation states is superior to that of fluorine in many cases. So the stat

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