Intermolecular Forces

Q. Given
$\begin{array}{ccccc}\text{Gas}& H_2& C{H}_4& C{O}_2& S{O}_2\\ \text{Critical}& 33& 190& 304& 630\end{array}$
Temperature /K
On the basis of data given above, predict which of the following gases shows least adsorption on a definite amount of charcoal ?

1. $S{O}_2$
2. $H_2$
3. $C{H}_4$
4. $C{O}_2$

Q.

Van der Waals forces

1. can be repulsive

2. can be attractive

3. include London dispersion forces

4. all of the above

Q. Which of the following will have the highest surface tension?

1. Water
2. Ethanol
3. Methanol
4. Ethanal

Q. The most viscous liquid among the following is:

1. Ethanol
2. Glycerol
3. Acetic Acid
4. Ethylene glycol

Q. Arrange the following in increasing order of surface tension. I(water), II(ethanol), III(hexane)

1. I < II < III
2. II < I < III
3. III < I < II
4. III < II < I

Q. The intermolecular force that is inversely proportional to $r^6$ among the following:
(Where r is the distance between the two atoms)

1. Ion - ion interaction
2. Ion - dipole interaction
3. London force
4. Dipole - dipole interaction

Q.

The interaction energy of London force is inversely proportional to sixth power of the distance between two interacting particles but their magnitude depends upon

(a) charge of interacting particles

(b) mass of interacting particles

(c) polarisability of interacting particles

(d) strength of permanent dipoles in the particles

Q.

In the following question, a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below in each question.

Assertion (A) Three states of matter are the result of the balance between intermolecular forces and thermal energy of the molecules.

Reason (R) Intermolecular forces tend to keep the molecules together but the thermal energy of molecules tends to keep them apart.

(a) Both A and R are true and R is the correct explanation of A

(b) Both A and R are true and R is not the correct explanation of A

(c) A is true but R is false

(d) A is false but R is true

Q.

QUESTION 2.23(i)

Suggest the most important type of intermolecular attractive interaction in the following pairs.

(i) n - hexane and n - octane

(ii) $I_{2}andCC{l}_4$

(iii) $NaCl{O}_{4}andwater$

(iv) Methanol and acetone

(v) Acetonitrile $\left(C{H}_{3}CN\right)$ and acetone $\left(C_3{H}_{6}O\right)$

Q. Explain ion-dipole interaction with suitable example.