Question

Match List-I with List-II.

List - I		List - II
A.	Cohesive Energy	I.	Energy required to remove electron from atom
B.	Work Function	II.	Energy required to remove electron from metal surface
C.	Electron Affinity	III.	Energy released when electron is added
D.	Ionization Potential	IV.	Energy required to separate crystal into individual atoms

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

Hint:

Cohesive energy separates a crystal into atoms; work function removes an electron from a metal surface.

Answer 1

The Correct Option is A

Concept:
These terms describe different energy quantities related to atoms, electrons and solids.

Step 1: Cohesive energy.
Cohesive energy is the energy required to separate a crystal into individual atoms. \[ A\rightarrow IV \]

Step 2: Work function.
Work function is the minimum energy required to remove an electron from a metal surface. \[ B\rightarrow II \]

Step 3: Electron affinity.
Electron affinity is the energy released when an electron is added to an atom. \[ C\rightarrow III \]

Step 4: Ionization potential.
Ionization potential is the energy required to remove an electron from an isolated atom. \[ D\rightarrow I \] Therefore: \[ A-IV,\ B-II,\ C-III,\ D-I \] \[ \therefore \text{Correct Answer is (A)} \]