Question

Match the following: 

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

Hint:

Periodic trends in ionization enthalpy, electronegativity, and electron gain enthalpy increase across a period and decrease down a group, while metallic character shows the opposite trend. Understanding these patterns helps in predicting element behavior.

Answer 1

The Correct Option is B

Step 1: Understanding the Matching Pairs - Ionization Enthalpy (A-III): The ionization enthalpy trend is \( B<Be<C<O<N \), as ionization energy increases across a period and is affected by electronic configuration. 
- Metallic Character (B-I): The metallic character follows \( P<Si<Mg<Na \), as metals tend to lose electrons easily. 
- Electron Gain Enthalpy (C-IV): The electron gain enthalpy follows \( I<Br<F<Cl \), as halogens have high electron affinity. 
- Electronegativity (D-II): The electronegativity trend follows \( I<N<O<F \), as it increases across a period and decreases down a group. 
Step 2: Evaluating the Options - Option (1): Incorrect – Incorrect assignment of electron gain enthalpy and metallic character. 
- Option (2): Correct – The assignments match the given trends in periodic properties. 
- Option (3): Incorrect – Incorrect placement of ionization enthalpy and electronegativity trends. 
- Option (4): Incorrect – Incorrect matching of ionization enthalpy and metallic character. 
Step 3: Conclusion Thus, the correct matching is A-III, B-I, C-IV, D-II, corresponding to option (2).