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JEE MainChemistryd and f Block Elements

Consider the structure and bonding in the molecule of manganese heptoxide ( Mn ₂ O ₇ ). Which of the following statements is incorrect?

Options

  1. AIt contains one Mn - O - Mn bridging bond.
  2. BIt contains a direct Mn - Mn covalent bond.
  3. CThe geometry around each Mn atom is tetrahedral.
  4. DIt contains six terminal Mn = O double bonds.

Correct answer

B. It contains a direct Mn - Mn covalent bond.

Step-by-step solution

Manganese heptoxide ( Mn ₂ O ₇ ) consists of two MnO ₄ tetrahedra sharing a single oxygen atom at a common vertex. Therefore, the molecule has an O ₃ Mn - O - MnO ₃ connectivity. It contains one Mn - O - Mn bridge and six terminal Mn = O double bonds. The geometry around each Mn centre is tetrahedral. There is no direct Mn - Mn bond in the molecule. Thus, the statement claiming the presence of a direct Mn - Mn covalent bond is incorrect. Answer: It contains a direct Mn - Mn covalent bond.

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