| Directions: (Q. 16 to 20) |
| Case IV: Read the passage given below and answer the following questions from 16 to 20. |
| An ideal solution may be defined as the solution which obeys Raoult's law exactly over the entire range of concentration. The solutions for which vapour pressure is either higher or lower than that predicted by Raoult's law are called non- ideal solutions. |
| Non-ideal solutions can show either positive or negative deviations from Raoult's law depending on whether the A-B interactions in solution are stronger or weaker than A-A and B-B interactions. |
| Which of the following solutions is/are ideal solution(s)? |
| (I) Bromoethane and iodoethane |
| (II) Acetone and chloroform |
| (III) Benzene and acetone |
| (IV) n-Heptane and n-Hexane |
A) Only I
B) I and II
C) II and III
D) I and IV
Correct Answer: D
Solution :
II represents negative deviations and III represents positive deviations.
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