Consider the following statements
I.Electron affinity is positive but electron gain enthalpy is negative
II.Electron affinity describes the tight ness with which an atom binds the extra electron added to it
Select the correct statement

Options

A. only I
B. Only II
C. I and II
D. none of these

Answer

To solve the given question, we will analyze both statements regarding electron affinity and electron gain enthalpy step by step.

### Step 1: Understanding Electron Affinity and Electron Gain Enthalpy
- **Electron Affinity** refers to the amount of energy released when an electron is added to a neutral atom in the gas phase. It is generally a measure of how much an atom wants to gain an electron.
- **Electron Gain Enthalpy** is the change in enthalpy when an electron is added to a neutral atom. This can be either negative (exothermic process) or positive (endothermic process).

**Hint for Step 1:** Remember that electron affinity is often related to the energy change associated with adding an electron to an atom.

### Step 2: Analyzing Statement I
- The first statement claims that "Electron affinity is positive but electron gain enthalpy is negative."
- This is generally true for most elements (especially halogens) where the addition of an electron releases energy (negative electron gain enthalpy), making the electron affinity a positive value (since it is the negative of electron gain enthalpy).

**Hint for Step 2:** Consider the behavior of halogens and noble gases when they gain electrons.

### Step 3: Analyzing Statement II
- The second statement claims that "Electron affinity describes the tightness with which an atom binds the extra electron added to it."
- This statement is also true. Electron affinity indicates how strongly an atom can attract and hold onto an additional electron.

**Hint for Step 3:** Think about how the concept of attraction relates to the energy released when an electron is added.

### Step 4: Conclusion
- Both statements are correct based on the definitions and behaviors of electron affinity and electron gain enthalpy.
- Therefore, the correct answer is that both statements are true.

**Final Answer:** Both statements are correct.