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Assertion : In Liwis structures of NF(3...

Assertion : In Liwis structures of `NF_(3) and CO_(3)^(2-)`, nitrogen and carbon occupy the central position whereas fluorine and oxygen occupy the terminal positions.
Reason : In Lewis representation, the least electronegative atom occupies the central position in the molecule/ion.

A

If both assertion and reason are true and reason is the correct explanation of assertion.

B

If both assertion and reason are true but reason in not the correct explanation of assertion.

C

If assertion is true but reason is false.

D

If both assertion and reason are false.

Text Solution

AI Generated Solution

The correct Answer is:
To analyze the assertion and reason provided in the question, we will break down the concepts related to Lewis structures and the positioning of atoms based on electronegativity. ### Step 1: Understand the Assertion The assertion states that in the Lewis structures of NF₃ (nitrogen trifluoride) and CO₃²⁻ (carbonate ion), nitrogen and carbon are central atoms while fluorine and oxygen are terminal atoms. ### Step 2: Analyze the Reason The reason given is that in Lewis representation, the least electronegative atom occupies the central position in the molecule or ion. ### Step 3: Identify the Central Atom For NF₃: - Nitrogen (N) has an electronegativity of about 3.04. - Fluorine (F) has an electronegativity of about 3.98. - Since nitrogen is less electronegative than fluorine, nitrogen occupies the central position. For CO₃²⁻: - Carbon (C) has an electronegativity of about 2.55. - Oxygen (O) has an electronegativity of about 3.44. - Since carbon is less electronegative than oxygen, carbon occupies the central position. ### Step 4: Draw the Lewis Structures 1. **Lewis Structure of NF₃**: - Nitrogen (N) is the central atom with one lone pair and three single bonds to three fluorine (F) atoms. - The structure can be represented as: ``` F | F-N-F | : ``` 2. **Lewis Structure of CO₃²⁻**: - Carbon (C) is the central atom with one double bond to one oxygen and single bonds to the other two oxygens, along with a negative charge distributed. - The structure can be represented as: ``` O || O=C-O^(-) | O^(-) ``` ### Step 5: Conclusion Both the assertion and the reason are true. The assertion correctly identifies the positions of nitrogen and carbon as central atoms in their respective Lewis structures, and the reason accurately explains why the least electronegative atom occupies the central position. ### Final Answer Both the assertion and the reason are true, and the reason is the correct explanation for the assertion. ---
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