Consider following statements :
  (A): The gas whose critical temperature is above room temperature can be liquified by applying sufficient pressure to the gas.
(B): The gas whose critical temperature is below room temperature can be liquified by the temperature below `T_c`. 
Select correct statement 

Options

A. A
B. B
C. both
D. none

Answer

To solve the question, we will analyze both statements (A) and (B) regarding the critical temperature of gases and their ability to be liquefied.

### Step-by-Step Solution:

1. **Understanding Critical Temperature (Tc)**:
- The critical temperature of a gas is the temperature above which it cannot be liquefied, regardless of the pressure applied. This means that if a gas is at a temperature higher than its critical temperature, it will remain in the gaseous state no matter how much pressure is applied.

2. **Analyzing Statement A**:
- Statement A claims: "The gas whose critical temperature is above room temperature can be liquefied by applying sufficient pressure to the gas."
- If the critical temperature of a gas is above room temperature (approximately 298 K), it means that if the gas is at a temperature higher than its critical temperature, it cannot be liquefied by applying pressure. Therefore, this statement is **false**.

3. **Analyzing Statement B**:
- Statement B claims: "The gas whose critical temperature is below room temperature can be liquefied by the temperature below Tc."
- If the critical temperature of a gas is below room temperature, it means that at temperatures below its critical temperature, the gas can be liquefied by applying sufficient pressure. Therefore, this statement is **true**.

4. **Conclusion**:
- Based on the analysis, Statement A is false, and Statement B is true. Thus, the correct statement is **B**.

### Final Answer:
- The correct statement is **B**.

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