Objective Type Questions and Answers on Class 11 Chemistry Chapter 5 States of Matter

Questions
1 A gas described by van der Waals equation

(A) behaves similar to an ideal gas in the limit of large molar volumes

(B) behaves similar to an ideal gas in the limit of large pressures

(C) is characterized by van der Waals coefficients that are dependent on the identity of the gas but are independent of the temperature.

(D) has the pressure that is lower than the pressure exerted by the same gas behaving ideally.

Choose the correct option from below :

A (A) and (B) are correct
B (A) and (C) are correct
C (A), (B) and (D) are correct
D (A) ,(C) and (D) are correct

Answer:(A) ,(C) and (D) are correct
2 How does the surface tension of a liquid vary with increase in temperature?
A Remains same
B Decreases
C Increases
D No regular pattern is followed

Answer:Decreases
3 The value of gas constant per degree per mole is approximately
A 1 Cal
B 2 cal
C 3 cal
D 4 cal

Answer:2 cal
4 The rate of diffusion of methane at a given temperature is twice of a gas X. The molecular weight of X is
A 64
B 16
C 32
D 8

Answer:64
5 Match the column

Class 11 Chemistry Chapter 5

A p -> i , q-> iii, r -> ii, s -> iv
B p -> iv , q-> iii, r -> ii, s -> i
C p -> iv , q-> iii, r -> i, s -> ii
D p -> iii , q-> iv, r -> ii, s -> i

Answer:p -> iii , q-> iv, r -> ii, s -> i >
6 What is SI unit of viscosity coefficient (η)?
A Pascal
B Ns m–2
C km–2s
D N m–2

Answer: Ns m–2
7 Which of the following gases will have the highest rate of diffusion?
A O2
B C O2
C NH3
D N2

Answer:NH3
8 In Van der waals equation of state for a non-ideal gas, the term that accounts for intermolecular forces is
A (V-b)
B RT
C $P + \frac {a}{V^2}
D 1/RT

Answer:$P + \frac {a}{V^2}
9 Which of the following gas molecules has the largest mean free path?
A O2
B N2
C H2
D Cl2

Answer:H2
10 A person living in Nainital observed that cooking food without using pressure cooker takes more time. The reason for this observation is that at high altitude:
A pressure increases
B temperature decreases
C pressure decreases
D temperature increases

Answer:pressure decreases
11 Temperature which is same in both Celsius scale and Fahrenheit scale:
A 0°C
B 32°F
C -40°
D 40°C

Answer:-40°
12 Behavior of real gases near to that of ideal gases if:
A Low pressure and low temperature
B High Pressure and low temperature
C Low pressure and high temperature
D High Pressure and high temperature

Answer:Low pressure and high temperature
13 Compressibility factor for ideal gas is
A 0
B lies between 0 and 1
C 1
D Greater than 1

Answer:1
14 One gram molecule of a gas at N.T.P. occupies 22.4 litres.? This fact was derived from
A Dalton's theory
B Avogadro's hypothesis
C Grahm's law
D Law of gaseous volume

Answer:Avogadro's hypothesis
15 In the ideal gas equation, the gas constant R has the dimensions
A mole-atm K-1
B erg K-1
C litre-atm K-1 mole-1
D litre mole

Answer:litre-atm K-1 mole-1
16 Rate of diffusion of a gas is
A Directly proportional to its density
B Directly proportional to its molecular mass
C Directly proportional to the square root of its molecular mass
D Inversely proportional to the square root of its molecular mass

Answer:Inversely proportional to the square root of its molecular mass
17

Assertion (A): The temperature at which vapour pressure of a liquid is equal to the external pressure is called boiling temperature.

Reason (R) : At high altitude atmospheric pressure is high.

A Both A and R are true and R is the correct explanation of A
B Both A and R are true but R is not the correct explanation of A.
C A is true but R is false.
D A is false but R is true.

Answer:A is true but R is false.
18 Which one of the following is not a unit of pressure
A Kg m/s2
B Torr
C Pascal
D Bar

Answer:Kg m/s2
19 Vander Waal's constants 'a' and 'b' are related with _______ respectively
A Attractive force and bond energy of molecules
B Volume and repulsive force of molecules
C Shape and repulsive forces of molecules
D Attractive force and volume of the molecules

Answer:Attractive force and volume of the molecules
20 A real gas most closely approaches the behavior of an ideal gas at
A 16 atm and 200 K
B 1 atm and 273 K
C 15 atm and 600 K
D 0.1 atm and 400 K

Answer:0.1 atm and 400 K

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