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Assertion : Electron gain enthalpy of Cl...

Assertion : Electron gain enthalpy of Cl is more negative than F atom.
Reason : F is more electronegative than Cl atom.

A

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

B

If both Assertion & Reason are true but the reason is not the correct explanation of the assertion.

C

If Assertion is true statement but Reason is false.

D

If both Assertion and Reason are false statements.

Text Solution

AI Generated Solution

The correct Answer is:
To solve the assertion and reason question, we will analyze both the assertion and the reason step by step. ### Step 1: Understand the Assertion **Assertion**: The electron gain enthalpy of Cl is more negative than that of F. - **Electron Gain Enthalpy**: This is the amount of energy released when an electron is added to a neutral gaseous atom. A more negative value indicates that more energy is released, meaning the process is more favorable. - **Comparison**: Chlorine (Cl) has a more negative electron gain enthalpy than Fluorine (F). This means that when an electron is added to chlorine, it releases more energy compared to when an electron is added to fluorine. ### Step 2: Analyze the Reason **Reason**: F is more electronegative than Cl. - **Electronegativity**: Electronegativity is a measure of the tendency of an atom to attract a bonding pair of electrons. Fluorine is indeed more electronegative than chlorine due to its smaller atomic size, which allows it to attract electrons more effectively. ### Step 3: Correlate Assertion and Reason - While both statements are true, the reason provided does not explain why the assertion is true. The electron gain enthalpy of chlorine being more negative than that of fluorine is primarily due to the inter-electronic repulsion in fluorine when an electron is added, which destabilizes the atom. In contrast, chlorine has a larger atomic size, which allows for less repulsion and a more stable configuration upon gaining an electron. ### Conclusion - **Assertion**: True (Cl has a more negative electron gain enthalpy than F). - **Reason**: True (F is more electronegative than Cl), but it does not explain the assertion. ### Final Answer The correct option is that the assertion is true, but the reason is true but does not explain the assertion. ---
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