States of Matte...

Q. Which pair of molecules has the strongest dipole-dipole interactions?

Intermolecular forces can be out of the following:

Based on the following statements I and IS, select the correct answer from the codes given.

Statement I : Three states of matter are the result of balance between intermolecular forces and thermal energy of the molecules.

Statement II : Intermolecular forces tend to keep the molecules together but thermal energy of molecules tends to keep them apart.

In comparing gases with liquids , gases have ........ compressibility and...........density.

Van der waals forces include the following except

Dipole-dipole interaction energy between stationary polar molecules is proportional to x and that between rotating molecules is proportional to y. Assume distance between polar molecules as r, then x and y are

Direction (Q. Nos. 7-9) This section contains a paragraph, wach describing theory, experiments, data etc. three Questions related to paragraph have been given.Each question have only one correct answer among the four given options (a),(b),(c),(d)

Dipole-dipole forces act between the molecules possessing permanent dipole. Ends of dipoles possess ‘partial charges’. The partial charge is

Stronger intermolecular forces result in higher boiling point. Strength of London forces increases with number of electrons in the molecule. Boiling point of 

I. HF 293 K
II. HCl 189 K
III. HBr 206 K
IV. HI 238 K

Q. 
Based on the boiling points, predominant force which gives variation of boiling point of HCI < HBr < HI is

Stronger intermolecular forces result in higher boiling point. Strength of London forces increases with number of electrons in the molecule. Boiling point of 

I. HF 293 K
II. HCl 189 K
III. HBr 206 K
IV. HI 238 K

Q. 
HF has highest boiling point because of