Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R)
Assertion (A): Dissolved substances can be removed from a colloidal solution by diffusion through a parchment paper.
Reason (R): Particles in a true solution cannot pass through parchment paper but the colloidal particles can pass through the parchment paper.
In the light of the above statements, choose the correct answer from the options given below:
Assertion (A): Dissolved substances can be removed from a colloidal solution by diffusion through a parchment paper.
Reason (R): Particles in a true solution cannot pass through parchment paper but the colloidal particles can pass through the parchment paper.
In the light of the above statements, choose the correct answer from the options given below:
- (A)Both (A) and (R) are correct and (R) is the correct explanation of (A)
- (B)Both (A) and (R) are correct but (R) is not the correct explanation of (A)
- (C)(A) is correct but (R) is not correct✓ Correct
- (D)(A) is not correct but (R) is correct
Answer: (C)
Solution
Assertion (A) is correct: Dissolved substances (particles in true solution) can pass through parchment paper, while colloidal particles cannot. This process is called dialysis and is used to purify colloidal solutions by removing dissolved impurities.
Reason (R) is incorrect: It states the opposite of the truth. Particles in a true solution (smaller size, typically < 1 nm) CAN pass through parchment paper, while colloidal particles (1-100 nm) CANNOT pass through.
Therefore, (A) is correct but (R) is not correct.
Reason (R) is incorrect: It states the opposite of the truth. Particles in a true solution (smaller size, typically < 1 nm) CAN pass through parchment paper, while colloidal particles (1-100 nm) CANNOT pass through.
Therefore, (A) is correct but (R) is not correct.
JEE Main · 2022 · 27 Jul 2022 · Shift 2 · Single correct option