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In the dichromate anion (Cr2O7^(2-))...

In the dichromate anion `(Cr_2O_7^(2-))`

A

all Cr - O bonds are equivalent

B

6 Cr - O bonds are equivalent

C

3 Cr - O bonds are equivalent

D

no bonds in `Cr_2O_7^(2-)` are equivalent.

Text Solution

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The correct Answer is:
To solve the question regarding the dichromate anion `(Cr_2O_7^(2-))`, we will analyze the structure of the anion and the nature of the bonds present in it. ### Step-by-Step Solution: 1. **Identify the Composition of the Dichromate Ion**: The dichromate ion is represented as `Cr2O7^(2-)`. This indicates that there are two chromium (Cr) atoms and seven oxygen (O) atoms in the ion. 2. **Draw the Lewis Structure**: To understand the bonding in the dichromate ion, we need to draw its Lewis structure. The structure consists of two chromium atoms connected by bridging oxygen atoms and surrounded by other oxygen atoms. - The structure can be depicted as: ``` O || O - Cr - O || O - Cr - O || O ``` - In this structure, there are two types of oxygen: - **Bridging Oxygen**: The oxygen atoms that connect the two chromium atoms. - **Terminal Oxygen**: The oxygen atoms that are bonded to a single chromium atom. 3. **Analyze the Bonding**: - In the dichromate ion, there are six terminal oxygen atoms and one bridging oxygen atom. - The terminal oxygen atoms are involved in double bonds with chromium, while the bridging oxygen forms a single bond with both chromium atoms. 4. **Determine Bond Equivalence**: - The six terminal chromium-oxygen bonds are equivalent due to resonance. This means that the double bonds can be distributed among the terminal oxygen atoms. - The bridging oxygen bond is different from the terminal bonds, making it non-equivalent. 5. **Evaluate the Given Options**: - **Option 1**: All chromium-oxygen bonds are equivalent. (Incorrect) - **Option 2**: Only 6 chromium-oxygen bonds are equivalent. (Correct) - **Option 3**: Three chromium-oxygen bonds are equivalent. (Incorrect) - **Option 4**: No bonds are equivalent. (Incorrect) ### Conclusion: The correct option regarding the dichromate anion is **Option 2**: Only 6 chromium-oxygen bonds are equivalent.
To solve the question regarding the dichromate anion `(Cr_2O_7^(2-))`, we will analyze the structure of the anion and the nature of the bonds present in it. ### Step-by-Step Solution: 1. **Identify the Composition of the Dichromate Ion**: The dichromate ion is represented as `Cr2O7^(2-)`. This indicates that there are two chromium (Cr) atoms and seven oxygen (O) atoms in the ion. 2. **Draw the Lewis Structure**: ...
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