The document discusses multiple choice questions about unit cells, liquid properties, and acid-base titration curves. 1) In a simple cubic unit cell, each atom has 8 neighboring atoms. 2) The liquid with the lower vapor pressure at room temperature and 60°C exhibits hydrogen bonding. 3) The buffer region in the titration curve of a diprotic acid is indicated by points b and d, which correspond to the first and second equivalence points.

1. hoice Questions in a unit cell is defined as the number of spheres of its nearest (I) 30 poins)
Multiple-Choice 1) The coordination number of a central sphere in a unit cell is defined as the
neighbors. What is the coordination number in a simple cubic cell? A) 2 B)4 C)6 D)8 E)12
Answer:( 2) The vapor pressure of liquid A is lower than that of liquid B at room temperatu of
the following statements concerning about the liquids A and B is alwa 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. re, also
lower at 60°C. Which ys true? Answer: ( 3) The following plot shows a typical titration curve
for the titration of diprotic acid H,A (Kal 1.2 equivalence point is HA 10 4. Ka2 2.1 x 10-10 with
NaOH. Given that the principal A-containing species at the first 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
Answer: ( ?) points b and d C)point b and c D) points a and b E) points c and d
Solution
1) .In a simple cubic unit cell ,the atoms are present at the 8 corners of the cube and each atom at
the corner is shared by 8 unit cells ( spheres) and thus coordination no. in simple cubic unit cell
is 8 .
Option ( D) is correct.