COMEDK · Chemistry · 23. d and f Block Elements
Choose the incorrect statement from the following
- A \(\mathrm{Cu}\) (I) compounds in aqueous medium undergo disproportionation reaction
- B \(\mathrm{MoO}_3\) and \(\mathrm{WO}_3\) are not as strong oxidants as \(\mathrm{CrO}_3\)
- C The ability of Fluorine to stabilise the higher oxidation states of transition metals exceeds that of Oxygen
- D \(\mathrm{Cr}^{2+}\) is a stronger reducing agent than \(\mathrm{Fe}^{2+}\)
Answer & Solution
Correct Answer
(C) The ability of Fluorine to stabilise the higher oxidation states of transition metals exceeds that of Oxygen
Step-by-step Solution
Detailed explanation
(1) Correct: \(Cu^+\) is unstable in aqueous medium due to the much higher hydration energy of \(Cu^{2+}\). It undergoes disproportionation: \(2Cu^+(aq) \to Cu^{2+}(aq) + Cu(s)\). (2) Correct: Oxidising power decreases down Group 6. \(CrO_3\) is a strong oxidant while \(MoO_3\)…
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