Case Study Questions for Class 11 Chemistry Chapter 5 States of Matter

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Case Study Questions for Class 11 Chemistry Chapter 5 States of Matter

Question 1:

Intermolecular forces are the forces of attraction and repulsion that exist between molecules of a compound. These cause the compound to exist in a certain state of matter – solid, liquid or gas and affect the melting and boiling points of compounds as well as the solubilities of one substance in another. Attractive intermolecular forces are also called van der Waals’ forces. These are weak forces.

(i) Dipole-dipole forces act between the molecules possessing permanent dipole. Ends of dipoles possess ‘partial charges’. The partial charge is
(a) more than unit electronic charge
(b) equal to unit electronic charge
(c) less than unit electronic charge
(d) double the unit electronic charge

(ii) The nature of inter-particle forces in benzene is
(a) dipole-dipole interaction
(b) dispersion force
(c) ion-dipole interaction
(d) H-bonding

(iii) The interaction energy between two temporary dipoles is proportional to (where r is the distance between the two particles)

(a) 1/r4
(b) 1/r2
(c) 1/r5
(d) 1/r6

(iv) Attractive intermolecular forces known as van der Waals forces do not include which of the following types of interactions?
(a) London forces
(b) Dipole-dipole forces
(c) Ion-dipole forces
(d) Dipole-induced dipole forces

(v) In which of the following molecules, the van der Waals forces are likely to be the most
important in determining the m.pt. and b.pt?
(a) CO
(b) H2S
(c) Br2
(d) HCl

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