States of Matter: Chemistry Free Online Mock Test 1

By admin / January 11, 2025

5/5 - (1 vote)

0%

0

Report a question

What’s wrong with this question?
You cannot submit an empty report. Please add some details.

🧪States of Matter – 15 MCQ Quiz

🔢 Number of Questions: 15 MCQs
⏱️ Time Required: 15 minutes
📚 Subject: Chemistry (States of Matter)
🎯 Difficulty Level: Moderate (10+2 / NEET Level)

👨‍🎓 Ideal For:
NEET UG aspirants
10+2 Board/NCERT/17+Age Chemistry students
Competitive exam learners

📌 Key Features:
Concept-based questions
Covers important periodic trends
Helps in quick revision
Useful for mock test practice

🚀 Outcome:
After completing this quiz, you will be able to confidently understand and apply States of Matter in exams.

1 / 15

1. Which of the following is the correct mathematical relation for Charles law at constant pressure?
(a) VαT (b) Vαt. (c) Vα1/T (d) all of above

A

B

C

D

2 / 15

2. At 0°C, the density of a gaseous oxide at 2 bar is same as that of dinitrogen at 5 bar. What is the molecular mass of the oxide?

65u

90u

80u

70u

Answer: Using the expression, d =MP/RT , at the same temperature and for same density,
M₁P₁ = M₂P₂ (as R is constant)
(Gaseous oxide) (N₂)
or
M₁ x 2 = 28 x 5(Molecular mass of N₂ = 28 u)
or M₁ = 70u

3 / 15

3. Which of the following gases will have the lowest rate of diffusion?
(a) H₂ (b) N₂ (C) F₂ (d) O₂

A

B

C

D

4 / 15

4. The compressibility factor, z for an ideal gas is
(a) zero (b) less than one (c) greater than one (d) equal to one

A

B

C

D

5 / 15

5. Calculate the temperature of 4.0 moles of a gas occupying 5 dm³ at 3.32 bar (R = 0.083 bar dm³ K^-1 mol^-1)

45K

30K

50K

60K

6 / 15

6. What will be the pressure of the gas mixture when 0.5 L of H₂ at 0.8 bar and 2.0 L of dioxygen at 0.7 bar are introduced in all vessel at 27 °C?

1.2 bar

2.8 bar

1.8 bar

1.4 bar

Answer: Calculation of partial pressure of H₂ in 1L vessel P₁= 0.8 bar,
P₂= ? V₁= 0.5 L , V₂ = 1.0 L
As temperature remains constant, P₁V₁ = P₂V₂
(0.8 bar) (0.5 L) = P₂ (1.0 L) or P₂ = 0.40 bar, i.e., PH₂ = 0.40 bar
Calculation of partial pressure of 02 in 1 L vessel
P₁‘ V₁ = P₂‘V₂‘
(0.7 bar) (2.0 L) = P₂ (1L) or P₂‘ = 1.4 bar, i.e.,Po₂= 1.4 bar
Total pressure =P_Hz + P_Q2 = 0.4 bar + 1.4 bar = 1.8 bar

7 / 15

7. What will be the minimum pressure required to compress 500 dm³ of air at 1 bar to 200 dm³ at 30°C?

3.5 bar

2.5 bar

1.5 bar

0.5 bar

Answer: P₁ = 1 bar,P₂ = ? V₁= 500 dm³ ,V₂=200 dm³
As temperature remains constant at 30°C,
P₁V₁=P₂V₂
1 bar x 500 dm³ = P₂ x 200 dm³ or P₂=500/200 bar=2.5 bar

8 / 15

8. At constant temperature, the pressure of the gas is reduced to one-third, the volume
(a) reduce to one-third (b) increases by three times
(c) remaining the same (d) cannot be predicted

A

B

C

D

9 / 15

9. 2.9 g of a gas at 95°C occupied the same volume as 0.184 g of hydrogen at 17°C at the same pressure. What is the molar mass of the gas ?

40

20

60

45

10 / 15

10. The cleansing action of soaps and detergents is due to
(a) internal friction (b) high hydrogen bonding
(c) viscosity (d) surface tensions

A

B

C

D

11 / 15

11. Calculate the total pressure in a mixture of 8g of oxygen and 4g of hydrogen confined in a vessel of l dm³ at 27°C. R = 0.083 bar dm³ K^-1 mol^-1.

78 bar

56 bar

34 bar

60 bar

12 / 15

12. Viscosity of a liquid is a measure of
(a) repulsive forces between the liquid molecules
(b) frictional resistance
(c) intermolecular forces between the molecules
(d)none of the above

A

B

C

D

13 / 15

13. Calculate the total number of electrons present in 1.4 g of dinitrogen gas.

4.215 x 10^23 electrons.

6.215 x 10^23 electrons.

6.022 x 10^23 electrons.

6.023 x 10^24 electrons.

Answer: Molecular mass of N₂= 28g
28 g of N₂ has No. of molecules = 6.022 x 10²³ 1.4 g of
N₂ has No. of molecules = 6.022 x 10²³ x 1.4 g/28 g
= 3.011 x 10²² molecules.
Atomic No. of Nitrogen (N) = 7
1 molecule of N₂ has electrons = 7 x 2 = 14
3.011 x 10²² molecules of N₂ have electrons
= 14 x 3.011 x 10²²
= 4.215 x 10²³ electrons.

14 / 15

14. The average kinetic energy of the gas molecule is
(a) inversely proportional to its absolute temperature
(b) directly proportional to its absolute temperature
(c) equal to the square of its absolute temperature
(d) All of the above

A

B

C

D

15 / 15

15. With rise in temperature, the surface tension of a liquid
(a) decreases (b) increases
(c) remaining the same (d) none of the above

A

B

C

D

Your score is
The average score is 0%
0%