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Each question contains STATEMENT-I(Asser...

Each question contains STATEMENT-I(Assertion) and STATEMENT-2(Reason).the statement carefully and mark the correct answer accoring to the instrution given below:
STATEMENT - 1 : Isotonic solutions do not show phenomenon of osmosis.
STATEMENT - 2 : Isotonic solutions have same molal concentration at same temperature.

A

If both the statements are TURE and STATEMENT-2 is the correct explanation STATEMENT-1

B

If both the statements are TURE but STATEMENT-2 is NOT the correct explanation STATEMENT-1

C

If STATEMENT-1 is TURE and STATEMENT-2 is FALSE

D

If STATEMENT-1 is FA,SE and STATEMENT-2 is TRUE

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question, we need to analyze both statements provided: **STATEMENT - 1:** Isotonic solutions do not show the phenomenon of osmosis. **STATEMENT - 2:** Isotonic solutions have the same molal concentration at the same temperature. ### Step-by-Step Solution: 1. **Understanding Isotonic Solutions:** - Isotonic solutions are defined as solutions that have the same osmotic pressure. This means that when two solutions are isotonic, there is no net movement of solvent molecules between them. **Hint:** Recall that osmotic pressure is a key factor in determining the movement of water across a semi-permeable membrane. 2. **Analyzing Statement 1:** - Since isotonic solutions have the same osmotic pressure, there is no driving force for the movement of solvent molecules from one solution to another. Therefore, it is correct to say that isotonic solutions do not show the phenomenon of osmosis. **Hint:** Consider what happens when two solutions have equal osmotic pressures. 3. **Analyzing Statement 2:** - The osmotic pressure (π) of a solution is given by the formula π = CRT, where C is the molar concentration, R is the gas constant, and T is the temperature. For two solutions to be isotonic, they must have the same osmotic pressure, which implies that their concentrations (C) must also be the same when the temperature (T) and gas constant (R) are constant. **Hint:** Think about how osmotic pressure relates to concentration and temperature. 4. **Conclusion:** - Both statements are correct. Statement 1 is true because isotonic solutions do not exhibit osmosis due to equal osmotic pressure. Statement 2 is also true because isotonic solutions must have the same molal concentration at the same temperature to maintain that equal osmotic pressure. - Furthermore, Statement 2 correctly explains Statement 1, as the equality of molal concentration leads to the equality of osmotic pressure, hence no osmosis occurs. ### Final Answer: Both statements are true, and Statement 2 is the correct explanation for Statement 1. **Correct Answer: A (Both statements are true, and Statement 2 is the correct explanation for Statement 1).**
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