Question

Match the following: 

• A. A-II, B-IV, C-I, D-III
• B. A-IV, B-II, C-I, D-III
• C. A-III, B-IV, C-IV, D-I
• D. A-III, B-III, C-IV, D-I

Hint:

Electron gain enthalpy generally becomes more negative across a period due to increasing nuclear charge but decreases down a group due to increased atomic size.

Answer 1

The Correct Option is A

Electron gain enthalpy is the energy change when an electron is added to an atom in the gaseous state.
- Fluorine (F) has an electron gain enthalpy of \( -328 \) kJ/mol (II).
- Chlorine (Cl) has an electron gain enthalpy of \( -349 \) kJ/mol (IV).
- Oxygen (O) has an electron gain enthalpy of \( -141 \) kJ/mol (I).
- Sulfur (S) has an electron gain enthalpy of \( -200 \) kJ/mol (III).
Thus, the correct matching is: \[ A \to II, \quad B \to IV, \quad C \to I, \quad D \to III \]