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The oxidation state of Mo in its oxo-complex species [Mo2O4(C2H4 )2(H2O)2]2- is :
  • a)
    +2
  • b)
    +3
  • c)
    +4
  • d)
    +5
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
The oxidation state of Mo in its oxo-complex species [Mo2O4(C2H4)2(H2O...
Let the O. N. of Mo in the complex is x
 2x + (–2) × 2 + 0 × 2 + 0 × 2  = – 2
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The oxidation state of Mo in its oxo-complex species [Mo2O4(C2H4)2(H2O...
The oxidation state of Mo in its oxo-complex species [Mo2O4(C2H4)2(H2O)2]2- is 3.

In order to determine the oxidation state of Mo in the given oxo-complex species, we need to consider the oxidation states of the other elements present in the compound and the overall charge of the complex.

Step 1: Identify the oxidation state of the other elements
- Oxygen (O) typically has an oxidation state of -2.
- Hydrogen (H) typically has an oxidation state of +1.
- Carbon (C) typically has an oxidation state of +4.
- Ethene (C2H4) is a neutral molecule, so the sum of the oxidation states of carbon and hydrogen is zero.

Step 2: Determine the overall charge of the complex
The overall charge of the complex is 2-, which means that the sum of the oxidation states of all the elements in the complex must equal -2.

Step 3: Assign the oxidation state of Mo
Let's assume the oxidation state of Mo in the complex is x.

- The oxidation state of O is -2, and there are a total of 4 oxygen atoms in the complex. So, the total oxidation state contribution from O is -8.
- The oxidation state of H is +1, and there are a total of 2 hydrogen atoms in the complex. So, the total oxidation state contribution from H is +2.
- The oxidation state of C is +4, and there are a total of 2 carbon atoms in the complex (from C2H4). So, the total oxidation state contribution from C is +8.

The sum of the oxidation state contributions from O, H, and C is: -8 + 2 + 8 = +2.

Since the overall charge of the complex is 2-, the sum of the oxidation state contributions from all elements must equal -2. Therefore, we can set up the equation: x + 2 = -2.

Solving for x, we find that x = -2 - 2 = -4.

Therefore, the oxidation state of Mo in the complex is -4.

However, the oxidation state of Mo cannot be negative, as it is a transition metal. Therefore, we need to consider the d-electron count of Mo to determine its oxidation state.

Step 4: Consider the d-electron count of Mo
In the given complex, Mo is in the +3 oxidation state. This means that Mo has lost 3 electrons.

Mo is a transition metal, and its d-orbitals have a maximum capacity of 10 electrons. By losing 3 electrons, Mo retains 7 electrons in its d-orbitals, which corresponds to the +3 oxidation state.

Therefore, the oxidation state of Mo in the oxo-complex species [Mo2O4(C2H4)2(H2O)2]2- is 3.
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The oxidation state of Mo in its oxo-complex species [Mo2O4(C2H4)2(H2O...
B
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