Statement-1: Ionization potential of Sn is less than Pb.
Statement-2 : Ionization potential is inversaly proportional to atomic size.

Options

A. Statement-1 is true, statement-2 is true and statement-2 is correct explanation for statement-1.
B. Staterment-1 is true, statement-2 is true and statement-2 is NOT the correct explanation for statement-1.
C. Statement-1 is true, statement-2 is false.
D. Statement-1 is false, statement-2 is true.

Answer

To solve the question, we need to analyze both statements regarding ionization potential (IP) of tin (Sn) and lead (Pb), and the relationship between ionization potential and atomic size.

### Step 1: Understanding Ionization Potential
Ionization potential (or ionization energy) is defined as the minimum energy required to remove an electron from the outer shell of an atom. Generally, the higher the ionization potential, the more energy is required to remove an electron.

### Step 2: Comparing Tin and Lead
Tin (Sn) is located in the fifth period of the periodic table, while lead (Pb) is in the sixth period. As we move down a group in the periodic table, the atomic size increases due to the addition of electron shells. This increase in size typically leads to a decrease in ionization potential because the outer electrons are further from the nucleus and experience less electrostatic attraction.

### Step 3: Analyzing Statement 1
Statement 1 claims that the ionization potential of Sn is less than that of Pb. However, this is incorrect. In fact, lead has a lower ionization potential than tin because it is located in a lower period (sixth period) and has a larger atomic size. Therefore, Statement 1 is false.

### Step 4: Analyzing Statement 2
Statement 2 states that ionization potential is inversely proportional to atomic size. This is generally true: as atomic size increases, the ionization potential decreases. Therefore, Statement 2 is true.

### Conclusion
- Statement 1 is **false**: The ionization potential of Sn is actually greater than that of Pb.
- Statement 2 is **true**: Ionization potential is inversely proportional to atomic size.

### Final Answer
- Statement 1: False
- Statement 2: True