Highest oxidation state of $Mn$ is exhibited in $Mn _2 O _7$ The correct statements about $Mn _2 O _7$ are
(A) Mn is tetrahedrally surrounded by oxygen atoms
(B) $Mn$ is octahedrally surrounded by oxygen atoms
(C) Contains $Mn-O-Mn$ bridge
(D) Contains $Mn - Mn$ bond
Choose the correct answer from the options given below:
(A) Mn is tetrahedrally surrounded by oxygen atoms
(B) $Mn$ is octahedrally surrounded by oxygen atoms
(C) Contains $Mn-O-Mn$ bridge
(D) Contains $Mn - Mn$ bond
Choose the correct answer from the options given below:
- A and D only
- A and C only
- B and C only
- B and D only
The Correct Option is B
Solution and Explanation
In \( \text{Mn}_2\text{O}_7 \), manganese (\( \text{Mn} \)) is in its highest oxidation state of +7. The molecular structure of \( \text{Mn}_2\text{O}_7 \) exhibits the following features:
- Each Mn atom is tetrahedrally surrounded by oxygen atoms, as the \( \text{MnO}_4^- \) tetrahedral unit is a part of the molecule.
- The molecule contains an Mn-O-Mn bridge linking the two tetrahedral units.
- There is no Mn-Mn bond in \( \text{Mn}_2\text{O}_7 \).
- Mn is not octahedrally surrounded by oxygen atoms.
Based on these points, the correct statements are:
- (A) Mn is tetrahedrally surrounded by oxygen atoms.
- (C) Contains Mn-O-Mn bridge.
Conclusion: The correct answer is 2 (A and C only)
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Concepts Used:
Redox Reactions
Redox Reaction:
Redox reactions are chemical reactions where oxidation and reduction take place simultaneously. In this type of reaction, there is a gain of electrons for one chemical species while the other loses electrons or simply involves transfer of electrons. The species that loses electrons is oxidized while the one that gains electrons is reduced.
Types of Redox Reactions:
Redox reactions can be differentiated into 4 categories namely combination reactions, decomposition reactions, displacement reactions, and disproportionation reactions. Each is explained separately below:
Combination Reaction:
In this, the molecules combine to form new compounds. For example, when magnesium reacts to nitrogen.
Decomposition Reaction:
Opposite to the combination reaction, here there is a breakdown of compounds to simpler substances. For example, electrolysis of water.
Displacement Reaction:
In this, the more reactive metal will displace the less reactive one in a chemical reaction. The reactivity of an element is represented in a series called the reactivity series (arranged in decreasing order of reactivity) which makes it easier to determine the chemical reaction and its products.
Disproportionation Reaction:
This is a peculiar type of reaction where an element showing a particular oxidation state will be oxidized and reduced simultaneously. Another thing to note is that these reactions will always have an element that can exhibit three oxidation states.