Three types of potential energy due to attractive interaction between two species X and Y are represented by the curves I , II , and III in the figure below. Consider the dominating interaction between non-rotating species ( X … Y ) for X = Na + , CH 3 2 CO , C 6 H 6 , CH 4 and Y = CH 3 2 CO , Cl - , C 2 H 6 , CHCl 3 . The correct assignment of the X ... Y interactions to the types I , II , and III is:

Na + … Cl - = III ; C 6 H 6 … CH 3 2 CO = I ; CH 4 … C 2 H 6 = I ; CH 3 2 CO … CHCl 3 = II .

Na + … Cl - = III ; C 6 H 6 … CH 3 2 CO = I ; CH 4 … C 2 H 6 = II ; CH 3 2 CO … CHCl 3 = III .

Na + … Cl - = II ; C 6 H 6 … CH 3 2 CO = II ; CH 4 … C 2 H 6 = III ; CH 3 2 CO … CHCl 3 = I .

Na + … Cl - = I ; C 6 H 6 … CH 3 2 CO = III ; CH 4 … C 2 H 6 = II ; CH 3 2 CO … CHCl 3 = II .

Increasing order of boiling points in the following compounds is: CH 3 COOH ( i ) CH 3 CH 2 CHO ( ii ) CH 3 CH 2 CH 2 OH ( iii ) CH 3 COCH 3 ( iv )

( ii ) < ( i v ) < ( i i i ) < ( i )

( ii ) < ( i v ) > ( i i i ) < ( i )

( iv ) < ( ii ) > ( i ) < ( iii )

( iv ) < ( iii ) < ( ii ) < ( i )

Match the type of interaction in column A with the distance dependence of their interaction energy in column B : A B (i) ion - ion (a) 1 r (ii) Dipole - dipole (b) 1 r 2 (iii) London dispersion (c) 1 r 3 (d) 1 r 6

(i) – (a); (ii) – (c); (iii) – (d)

(i) – (b); (ii) – (d); (iii) – (c)

(i) – (a); (ii) – (b); (iii) – (d)

(i) – (a); (ii) – (b); (iii) – (c)

Suggest the most important type of intermolecular attractive interaction in the following pairs. (i) n-hexane and n-octane (ii) I 2 and CCl 4 (iii) NaClO 4 and water (iv) Methanol and acetone (v) Acetonitrile (CH 3 CN) and acetone (C 3 H 6 O) Make selections from the following choices.

(i) London's forces (ii) London's forces (iii) Ion dipole interactions (iv) Intermolecular H-bonding (v) Dipole-dipole interaction

(i) Ion dipole interactions (ii) Intermolecular H-bonding (iii) London's forces (iv) London's forces (v) Dipole-dipole interaction

(i) Dipole-dipole interaction (ii) Intermolecular H-bonding (iii) Ion dipole interactions (iv) London's forces (v) London's forces

(i) Dipole-dipole interaction (ii) London's forces (iii) London's forces (iv) Intermolecular H-bonding (v) Ion dipole interactions

EASY

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The intermolecular attraction that is dependent on the inverse cube of the distance between the molecules is

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Important Questions on States of Matter

MEDIUM

Chemistry>Physical Chemistry>States of Matter>Intermolecular Forces and Thermal Energy

In which of the following solid substance dispersion forces exist?

MEDIUM

Chemistry>Physical Chemistry>States of Matter>Intermolecular Forces and Thermal Energy

Rare gases are sparingly soluble in water because of

EASY

Chemistry>Physical Chemistry>States of Matter>Intermolecular Forces and Thermal Energy

The dipole-dipole interaction energy between stationary polar molecules and rotating polar molecules, respectively is proportional to
[

r

is the distance between the polar molecules]

HARD

Chemistry>Physical Chemistry>States of Matter>Intermolecular Forces and Thermal Energy

The dipole-dipole interaction energy between rotating polar molecules is proportional to, where '

r

' is the distance between polar molecules.

EASY

Chemistry>Physical Chemistry>States of Matter>Intermolecular Forces and Thermal Energy

The relative strength of the interionic/ intermolecular forces in a decreasing order is:

EASY

Chemistry>Physical Chemistry>States of Matter>Intermolecular Forces and Thermal Energy

Three types of potential energy due to attractive interaction between two species $X$ and $Y$ are represented by the curves $I, II,$ and $III$ in the figure below.

Question Image
Consider the dominating interaction between non-rotating species $(X \dots Y)$ for $X = {Na}^{+}, {({CH}_{3})}_{2} CO$ , $C_{6} H_{6}, {CH}_{4}$ and $Y = {({CH}_{3})}_{2} CO, {Cl}^{-}, C_{2} H_{6}, {CHCl}_{3}$ . The correct assignment of the $X$ ... $Y$ interactions

to the types $I, II$ , and $III$ is:

EASY

Chemistry>Physical Chemistry>States of Matter>Intermolecular Forces and Thermal Energy

The interaction energy of London forces between two particles is proportional to

r^{x}

, where

r

is the distance between the particles. The value of

x

is :

EASY

Chemistry>Physical Chemistry>States of Matter>Intermolecular Forces and Thermal Energy

Increasing order of boiling points in the following compounds is:

$\underset{(i)}{{CH}_{3} COOH} \underset{(ii)}{{CH}_{3} {CH}_{2} CHO} \underset{(iii)}{{CH}_{3} {CH}_{2} {CH}_{2} OH} \underset{(iv)}{{CH}_{3} {COCH}_{3}}$

EASY

Chemistry>Physical Chemistry>States of Matter>Intermolecular Forces and Thermal Energy

The type of attractive forces that operate between gaseous

HCl

molecules is

MEDIUM

Chemistry>Physical Chemistry>States of Matter>Intermolecular Forces and Thermal Energy

Match the type of interaction in column $A$ with the distance dependence of their interaction energy in column $B :$

A	B
(i) ion - ion	(a) $\frac{1}{r}$
(ii) Dipole - dipole	(b) $\frac{1}{r^{2}}$
(iii) London dispersion	(c) $\frac{1}{r^{3}}$
	(d) $\frac{1}{r^{6}}$

EASY

Chemistry>Physical Chemistry>States of Matter>Intermolecular Forces and Thermal Energy

Which intermolecular force is most responsible in allowing xenon gas to liquefy?

EASY

Chemistry>Physical Chemistry>States of Matter>Intermolecular Forces and Thermal Energy

The predominant intermolecular forces present in ethyl acetate, a liquid, are:

EASY

Chemistry>Physical Chemistry>States of Matter>Intermolecular Forces and Thermal Energy

The intermolecular interaction that is dependent on the inverse cube of distance between the molecules is:

EASY

Chemistry>Physical Chemistry>States of Matter>Intermolecular Forces and Thermal Energy

Oxygen and sulphur, both are the members of the same group in periodic table, but

H_{2} O

is a liquid while

H_{2} S

is a gas because

EASY

Chemistry>Physical Chemistry>States of Matter>Intermolecular Forces and Thermal Energy

Type of forces between molecules of

C_{6} H_{6}

are

EASY

Chemistry>Physical Chemistry>States of Matter>Intermolecular Forces and Thermal Energy

Which of the following has the strongest hydrogen bond?

EASY

Chemistry>Physical Chemistry>States of Matter>Intermolecular Forces and Thermal Energy

The maximum number of hydrogen bonds that a molecule of water can have are

EASY

Chemistry>Physical Chemistry>States of Matter>Intermolecular Forces and Thermal Energy

Which is the weakest among the following type of bond ?

EASY

Chemistry>Physical Chemistry>States of Matter>Intermolecular Forces and Thermal Energy

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

(i) n-hexane and n-octane
(ii) I₂ and CCl₄
(iii) NaClO₄ and water
(iv) Methanol and acetone
(v) Acetonitrile (CH₃CN) and acetone (C₃H₆O)

Make selections from the following choices.

HARD

Chemistry>Physical Chemistry>States of Matter>Intermolecular Forces and Thermal Energy

Which of the following is most volatile in nature?

The intermolecular attraction that is dependent on the inverse cube of the distance between the molecules is

Important Questions on States of Matter

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