2) The vapor pressure of liquid A is lower than that of liquid B at room temperature, also lower
at 60°C. Which of the following statements concerning about the liquids A and B is always
true? A) Both liquids A and B much exhibit hydrogen bonding. B) Both liquids A and B much
have ion-induced dipole interactions C) Both liquids A and B much have ion-dipole forces. D)
Both liquids A and B much have London forces. E) Both liquids A and B much have dipole-
dipole forces. Answer: 3) The following plot shows a typical titration curve for the titration of
diprotic acid HA (Ka1 -1.2x10 K2 -2.1 x 10-10) with NaOH. Given that the principal A-
containing species at the first equivalence point is HA pH Moles of OH added A buffer region is
indicated by which of these point(s) a-d in the titration curve? A) point a and c B) points b and d
C) point b and c D) points a and b Answer E) points c and d
Solution
Answer-2 Option C)
Option A cannot be true as hydrogen bonding increases boiling point and more is the boiling
point less is the vapor pressure.This is also true for option E and D.
Answer 3- option A)
As point B and D shows equivalence point in titration
so Point A and C shows buffer region
Buffers should be made using an acid and its conjugate base (or a base and its conjugate acid );
the pair should have a K a very similar to the desired pH.