Question:
Which of the following statements are correct about \(\mathrm{CO_3^{2-}}\) ion?- The hybridisation of the central atom is \(sp^2\).
- The average formal charge on each oxygen atom is \(-\frac{2}{3}\).
- The resonance hybrid structure does not have one C--O single bond and two C=O double bonds; all C--O bonds are equivalent.
- All C--O bond lengths are equal.
Which of the following statements are correct about \(\mathrm{CO_3^{2-}}\) ion?
- The hybridisation of the central atom is \(sp^2\).
- The average formal charge on each oxygen atom is \(-\frac{2}{3}\).
- The resonance hybrid structure does not have one C--O single bond and two C=O double bonds; all C--O bonds are equivalent.
- All C--O bond lengths are equal.
Show Hint
For the carbonate ion \(\mathrm{CO_3^{2-}}\):
- Central atom is \(sp^2\)-hybridised.
- Geometry is trigonal planar.
- All three C--O bonds are equivalent due to resonance.
- Bond order of each C--O bond is \(\dfrac{4}{3}\).
Updated On: Jul 9, 2026
- II \& IV only
- I \& II only
- II \& III only
- I \& III only \bigskip
Show Solution
Verified By Collegedunia
The Correct Option is A
Solution and Explanation
Step 1: Analyse Statement I.
The central carbon atom in \(\mathrm{CO_3^{2-}}\) is \(sp^2\)-hybridised.
This statement is correct.
Step 2: Analyse Statement II. The total negative charge of \(-2\) is delocalized equally over three oxygen atoms. \[ \text{Average formal charge on each O} =\frac{-2}{3} =-0.67 \] Thus, the magnitude of the average formal charge on each oxygen atom is \(0.67\). Hence, Statement II is correct.
Step 3: Analyse Statement III. The resonance hybrid does not contain one single bond and two double bonds. Instead, all three C--O bonds are identical with bond order \[ \frac{4}{3}. \] Hence, Statement III is incorrect.
Step 4: Analyse Statement IV. Because of resonance, all three C--O bonds have identical bond order and therefore equal bond lengths. Hence, Statement IV is correct.
Step 5: Final conclusion. According to the given options, the correct answer is \[ \boxed{\text{II \& IV only}.} \] Hence, the correct option is \(\boxed{(A)}\).
Step 2: Analyse Statement II. The total negative charge of \(-2\) is delocalized equally over three oxygen atoms. \[ \text{Average formal charge on each O} =\frac{-2}{3} =-0.67 \] Thus, the magnitude of the average formal charge on each oxygen atom is \(0.67\). Hence, Statement II is correct.
Step 3: Analyse Statement III. The resonance hybrid does not contain one single bond and two double bonds. Instead, all three C--O bonds are identical with bond order \[ \frac{4}{3}. \] Hence, Statement III is incorrect.
Step 4: Analyse Statement IV. Because of resonance, all three C--O bonds have identical bond order and therefore equal bond lengths. Hence, Statement IV is correct.
Step 5: Final conclusion. According to the given options, the correct answer is \[ \boxed{\text{II \& IV only}.} \] Hence, the correct option is \(\boxed{(A)}\).
Was this answer helpful?
0
0
Top AP EAPCET Chemistry Questions
- The four quantum numbers of the valence electron of potassium are :
- The volume of $0.02\, M$ acidified permanganate solution required for complete reaction of $60\, mL$ of $0.01\, MI^{-}$ ion solution to form $I_2$ in $mL$ is
- In which of the following the election gain enthalpy of elements is correctly arranged?
- The radii of $ \text{F,}{{\text{F}}^{-}}\text{O} $ and $ {{\text{O}}^{2-}} $ are in the order
- Which of the following has the highest first ionization potential?
View More Questions
Top AP EAPCET Chemical bonding and molecular structure Questions
- The correct order of covalent bond character of \( BCl_3, CCl_4, BeCl_2, LiCl \) is:
Observe the following structure:
The formal charges on the atoms 1, 2, 3 respectively are:- The correct order of bond angles of H$_2$S, NH$_3$, BF$_3$, and SiH$_4$ is
- The hybridization and number of lone pair of electrons on central atom of SF$_4$ respectively are
- When burnt in air the metal 'X' forms only oxide, where as metal 'Y' forms oxide and nitride. X, Y respectively are
View More Questions
Top AP EAPCET Questions
- A body is projected from the ground at an angle of $\tan^{-1} \left( \frac{8}{7}\right)$ with the horizontal. The ratio of the maximum height attained by it to its range is
- The four quantum numbers of the valence electron of potassium are :
- A lens forms real and virtual images of an object, when the object is at $u_{1}$ and $u_{2}$ distances respectively. If the size of the virtual image is double that of the real image, then the focal length of the lens is (take, the magnification of the real image as $m$ )
- Two spheres $P$ and $Q$, each of mass $200\, g$ are attached to a string of length one metre as shown in the figure. The string and the spheres are then whirled in a horizontal circle about $O$ at a constant angular speed. The ratio of the tension in the string between $P$ and $Q$ to that of between $P$ and $O$ is $(P$ is at mid-point of the line joining $O$ and $Q$ )
- The volume of $0.02\, M$ acidified permanganate solution required for complete reaction of $60\, mL$ of $0.01\, MI^{-}$ ion solution to form $I_2$ in $mL$ is
View More Questions