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JEE MainChemistryd and f Block Elements

A 3d transition metal 'M' forms an oxide of formula M ₂ O ₇ which is strongly acidic in nature. Identify the INCORRECT statement regarding the metal 'M' and its compounds.

Options

  1. AThe oxide of 'M' in +4 oxidation state is amphoteric in nature.
  2. BThe spin-only magnetic moment of its divalent aquated ion is approximately 5.92 BM .
  3. CIt exhibits the largest number of oxidation states in its series.
  4. DIt has the highest enthalpy of atomization in the 3d series.

Correct answer

D. It has the highest enthalpy of atomization in the 3d series.

Step-by-step solution

The formation of a strongly acidic oxide with the formula M ₂ O ₇ indicates that the metal 'M' is in a +7 oxidation state. In the 3d transition series, Manganese (Mn) forms Mn ₂ O ₇ . Let us evaluate the given statements for Manganese (Mn). Mn exhibits oxidation states from +2 to +7 , which is the largest number of oxidation states in the 3d series. Thus, this statement is correct. The oxide of Mn in the +4 oxidation state is MnO ₂ , which is amphoteric. Thus, this statement is correct. The electronic configuration

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