1271. All_________ molecules have only London dispersion forces :

A. Mono atomic
B. Non-Polar
C. Homonuclear diatomic
D. All of those *

1272. Which of the following molecules have dipole-dipole Interactions:

A. PH3 *
B. NH3
C. H2O
D. CCL4

1273. Which of the following is necessary for H-Bonding :

A. N-H
B. O-H
C. F-H
D. All of these *

1274. Water can attach with ________ other water molecular through H-Bonding :

A. Two
B. Four *
C. Six
D. Eight

1275. HF is weak acid due to :

A. H-bonding *
B. Non-Polar nature
C. Weak H-F bond
D. All

1276. Secondary structure of protein is due to :

A. H-bonding
B. LDF
C. Both
D. None

1277. LDF exists in :

A. Polar molecules
B. Non-Polar molecules
C. Ionic compounds
D. Both A and B *

1278. Boiling Point CCL4 is higher than CHCL3:

A. High molecular size of CCL4 *
B. Polar C-CI bonds in CCL4
C. Non-polar C-H bonds in CHCL3
D. All of these

1279. Which of the following illustrate ion-dipole forces ?

A. Sugar dissolved in water
B. Table salt dissolved in water *
C. Bromine dissolved in water
D. Alcohol added to water

1280. Evaporation depends upon :

A. T
B. IMF
C. Surface area
D. All of these