States of Matter : Gases & Liquids Test 17

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States of Matter : Gases & Liquids Test 17

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Question 1
1 / -0

In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question.
Assertion (A): Three states of matter are the result of balance between intermolecular forces and thermal energy of the molecules.
Reason (R): Intermolecular forces tend to keep the molecules together but thermal energy of molecules tends to keep them apart.

A
A. Both A and R are true and R is the correct explanation of A.

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

C
C. A is true but R is false.

D
D. A is false but R is true.

Solution

Both the factors, i.e., intermolecular forces and thermal energy decide the state of matter. Balance is required in these two factors.
Question 2
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In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question.
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
A. Both A and R are true and R is the correct explanation of A.

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

C
C. A is true but R is false.

D
D. A is false but R is true.

Solution

The temperature at which the Vapour pressure of a liquid becomes equal to the external pressure is called its boiling point. As the altitude is high, pressure is low.
Question 3
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In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question.
Assertion (A): At constant temperature, pV vs V plot for real gases is not a straight line.
Reason (R): At high pressure, all gases have Z > 1 but at intermediate pressure most gases have Z < 1.

A
A. Both A and R are true and R is the correct explanation of A.

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

C
C. A is true but R is false.

D
D. A is false but R is true.

Solution

At constant temperature pV vs V plot for real gases is not a straight line because intermolecular forces of attraction are present in real gases.
Question 4
1 / -0

In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question.
Assertion (A): Liquids tend to have maximum number of molecules at their surface.
Reason (R): Small liquid drops have spherical shape.

A
A. Both A and R are true and R is the correct explanation of A.

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

C
C. A is true but R is false.

D
D. A is false but R is true.

Solution

Liquid tend to reduce number of molecules or surface tension at there surface, that's why small liquid drops have spherical shape.
Question 5
1 / -0

In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question.
Assertion (A): At critical temperature, liquid passes into gaseous state imperceptibly and continuously.
Reason (R): The density of liquid and gaseous phase is equal to critical temperature.

A
A. Both A and R are true and R is the correct explanation of A.

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

C
C. A is true but R is false.

D
D. A is false but R is true.

Solution

At critical temperature density of liquid becomes equal to its vapour phase. Due to which liquid changes into gaseous state imperceptibly and continuously.
Question 6
1 / -0

In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question.
Assertion (A): Gases do not liquefy above their critical temperature, even on applying high pressure.
Reason (R): Above critical temperature, the molecular speed is high and intermolecular attractions cannot hold the molecules together because they escape because of high speed.

A
A. Both A and R are true and R is the correct explanation of A.

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

C
C. A is true but R is false.

D
D. A is false but R is true.

Solution

Gases do not liquefy above their critical temperature even on applying high pressure because above a critical temperature, the molecular speed is high and intermolecular attractions cannot hold the molecules together because they escape because of high speed.
Question 7
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Match the graphs between the following variables with their names:

A
A. (i) c, (ii) a, (iii) d.

B
B. (i) d, (ii) a, (iii) c.

C
C. (i) c, (ii) d, (iii) a.

D
D. (i) a, (ii) c, (iii) d.

Solution

(i) The graph at constant molar volume is called Isochore.
(ii) The graph at constant temperature is called Isotherm.
(iii) The graph at constant pressure is called Isobar.
Question 8
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Match the following gas laws with the equation representing them.

A
A. (i) d, (ii) e, (iii) b, (iv) a.

B
B. (i) e, (ii) d, (iii) b, (iv) a.

C
C. (i) a, (ii) d, (iii) e, (iv) b.

D
D. (i) a, (ii) d, (iii) b, (iv) e.

Solution

A. Boyle's law, at constant T and n.
B. Charle's law, V ∝ T at constant p and n.
C. Dalton's law, p_Total = p₁ + p₂ + p₃ + ... at constant T, V.
D. Avogadro's law, V ∝ n at constant T and p.