# States of Matter MCQ Class 11 Chemistry

Please refer to Chapter 5 States of Matter MCQ Class 11 Chemistry with answers below. These multiple-choice questions have been prepared based on the latest NCERT book for Class 11 Chemistry. Students should refer to MCQ Questions for Class 11 Chemistry with Answers to score more marks in Grade 11 Chemistry exams. Students should read the chapter States of Matter and then attempt the following objective questions.

**MCQ Questions Class 11 Chemistry Chapter 5 States of Matter**

The States of Matter MCQ Class 11 Chemistry provided below covers all important topics given in this chapter. These MCQs will help you to properly prepare for exams.

**Question. At what temperature will the m1s velocity of SO _{2} be the same as that of O_{2} at 303 K? **

(a) 403 K

(b) 303 K

(c) 606 K

(d) 273 K

## Answer

C

**Question. For one mole of an ideal gas, increasing the temperature from l0°C to 20°C **

(a) increases the average kinetic energy by two times

(b) increases the rms value by √2 times

(c) increases the m1s velocity by two times

(d) increases both the average kinetic energy and rms velocity, but not significantly

## Answer

D

**Question. The ratio of masses of oxygen and nitrogen of a particular gaseous mixture is 1 : 4. The ratio is number of their molecule is**

(a) 1 : 4

(b) 7: 32

(c) 1 : 8

(d) 3: 16

## Answer

B

**Question. A gaseous mixture containing He, CH _{4} and SO_{2} was allowed to effuse through a fine hole, then find what molar ratio of gases coming out initially? (Given mixture contains He, CH_{4} and SO_{2} in 1 : 2 : 3 mole ratio).**

(a) ✓2 : ✓2 : 3

(b) 2 : 2: 3

(c) 4: 4: 3

(d) 1 : 1 : 3

## Answer

C

**Question. Density of carbon monoxide is maximum at **

(a) 2 atm and 600 K

(b) 0.5 atm and 273 K

(c) 6 atm and 1092 K

(d) 4 atrn and 500 K

## Answer

D

**Question. For one mole of an ideal gas, the slope of V versus T curve at constant pressure of 2 atm is XL mol ^{– 1} K^{-1} . The value of the ideal universal gas constant R in terms of X is**

(a) X L atm mol

^{-1}K

^{-1 }

(b) X/2 L atm mol

^{-1}K

^{-1 }

(c) 2X L atm mol

^{-1}K

^{-1 }

(d) 2X atm

^{L- 1}mol

^{– 1}K

^{-1 }

## Answer

C

**Question. The value of d (in cm) shown in the figure, as estimated from Graham’s law, is**

(a) 8

(b) 12

(c) 16

(d) 20

## Answer

C

**Question. The experimental value of dis found to be smaller than the estimate obtained using Graham’s law. This is due to**

(a) larger mean free path for X as a compared to that of Y

(b) larger mean free path for Y as compared to that of X

(c) increased collision frequency of Y with the inert gas as compared to that of X with the inert gas

(d) increased collision frequency of X with the inert gas as compared to that of Y with the inert gas

## Answer

D

**Question. The ratio of rates of diffusion of gases X and Y is 1 : 5 and that of Y and Z is 1 : 6. The ratio of rates of diffusion of Z and Xis**

(a) 1 : 30

(c) 30 : 1

(b) 1 : 6

(d) 6 : 1

## Answer

C

**Question. The rate of diffosion of methane at a given temperature is twice of a gas X The molar mass of the gas X is **

(a) 64

(b) 32

(c) 16

(d) 8

## Answer

A

**Question. Dalton’s law of partial pressure is not applicable to**

(a) O_{2} + O_{3}

(b) CO + CO_{2 }

(c) NH_{3} + HCI

(d) I + O_{2 }

## Answer

C

**Question. A bubble of volume V _{1 }is in the bottom of a pond at 15°C and 1.5 atm pressure, When it comes at the surface, it observes a pressure of I atm at 25°C and have volume V_{2} , then V_{2}/V_{1}is equal to: **

(a) 15.5

(c) 155.0

(b)0.155

(d) 1.55

## Answer

D

**Question. A certain mass of a gas occupies a volume of 2 L at STP. To what temperature the gas must be heated to double its volume, keeping the pressure constant? **

(a) l00K

(b) 273K

(c) 273°C

(d) 546°C

## Answer

C

**Question. If p, T, p and R represent pressure, temperature, density and universal gas constant respectively, then the molar mass of the ideal gas is given by **

(a) pRT/p

(b) pT/pR

(c) p/pRT

(d) RT/ PP

## Answer

A

**Question. To an evacuated vessel with movable piston under external pressure of 1 atm, 0.1 mole of He and 1.0 mole of an unknown compound (vapour pressure 0.68 atm at 0°C) are introduced. Considering the ideal gas behaviour, the total volume (in litre) of the gases at 0°C is close to**

(a) 3

(b) 5

(c) 7

(d) 9

## Answer

C

**Question. When r, p and M represent rate of diffusion, pressure and molecular mass, respectively, then the ratio of the rates of diffusion (r _{A} / r_{B} ) of two gases A and B, is given as**

(a) (p

_{A}/ p

_{B})

^{1/2}(m

_{A}/ m

_{B})

(b) (p

_{A}/ p

_{B}) (m

_{B}/ m

_{A})1/2

(C) (p

_{A}/ p

_{B})

^{1/2}(m

_{B}/ m

_{A})

(d) (p

_{A}/ p

_{B}) (m

_{A}/ m

_{B})1/2

## Answer

B

**Question. If 10 ^{-4} dm^{3} of water is introduced intoa i dm^{3} flask at 300 K, how many moles of water are in the vapour phase when equilibrium is established (given, vapour pressure of H_{2}O at 300 K is 3170 Pa, R = 8.314 JK^{-1} Mol^{-1})**

(a) 5.56x 10-6 mol

(b) l.53x 10-2 mol

(c) 4.46x 10-2 mol

(d) l.27x 10-3 mol

## Answer

D

**Question. In which one of the following does the given amount of chlorine exert the least pressure in a vessel of capacity I dm ^{3} at 273 K?**

(a) 0.0355 g

(b) 0.071g

(c) 6.023 x 10

^{21}

(d) 0.02 moles

## Answer

A

**Question. At a certain temperature, the time required for the complete diffusion of200 mL of H _{2} gas is 30 min. The time required for the complete diffusion of 50 mL of O_{2} gas at the same temperature will be**

(a) 60 min

(b) 30 min

(c) 45 min

(d) 15 min

## Answer

C

**Question. 0.5 mole of each of H _{2} , SO_{2} and CH_{4} are kept in a container. A hole was made in the container. After 3 h the order of partial pressures in the container will be**

(a) Pso

_{2}> PH

_{2}> PCH

_{4}

(b) Pso

_{2}> PCH

_{4}> PH

_{2}

(c) PH

_{2}> Pso

_{2}> PCH

_{4}

(d) PH

_{2}> PCH

_{4}> Pso

_{2 }

## Answer

B

**Question. 10 mL of oxygen and 10 mL of hydrogen is kept at the same temperature and pressure, which is co1rect about number of molecules?**

(a) NO_{2} > NH_{2}

(b) NO_{2 }< NH_{2}

(c) NO_{2 }= NH_{2}

(d) NO_{2 }= NH_{2 }

## Answer

D

**Question. A gas is heated through 1 °C in a closed vessel and so the pressure increases by 0.4%. The initial temperature of the gas was **

(a) -23° C

(b) +23° C

(c) 250°C

(d) 523°C

## Answer

A

**Question. The ratio of diffusion of hydrogen and helium gas is**

(a) 1 : 1.4

(b) 1 : 1

(c) 1.4 : 1

(d) 1 : 2

## Answer

C

**Question. A 4 : 1 mixture of helium and methane is contained in vessel at 1 Obar pressure. Due to a hole in the vessel, the gas mixture leaks out. The composition of mixture effusing out initially is **

(a) 8: 1

(b) 8: 3

(c) 4: 1

(d) 1 : 1

## Answer

A

**Question. Identify the pair of gases that have equal rates of diffusion**

(a) CO, NO

(b) N_{2}O, CO

(c) N_{2}O, CO_{2}

(d) CO_{2} , NO_{2 }

## Answer

C

**Question. If two molecules of A and B having mass 100 kg and 64 kg and rate of diffusion of A is 12 x 10 ^{-3} , then what will be the rate of diffusion of B? **

(a) 15 x 10

^{-3}

(b) 64 x 10

^{-3}

(c) 5 x 10

^{-3}

(d) 46 x 10

^{-3 }

## Answer

A

**Question. The density of a gas is 1.964 g dm ^{-3} at 273 Kand 76 cm Hg. The gas is **

(a) CH

_{4}

(b) C

_{2}H

_{6}

(c) CO

_{2}

(d) Xe

## Answer

C

**Question. Dalton’s law of partial pressure is applicable to which one of the following systems?**

(a) NH_{3} + HCI

(b) NO + O_{2}

(c) H_{2} + Cl_{2}

(d) CO + H_{2 }

## Answer

D

**Question. Gas equation pV = nRT is obeyed by ideal gas in**

(a) adiabatic process

(b) isothemal process

(c) Both (a) and (b)

(d) None of the above

## Answer

C

**Question. The density of O _{2} is 16 at NTP. At what temperature its density will be 14? Consider that the pressure remains constant, at **

(a) 50°C

(c) 57°C

(b) 39°c

(d) 43°C

## Answer

B

**Question. The molar volume of CO _{2} is maximum at **

(a) NTP

(b) 0°C and 2.0 atm

(c) 127°C and 1 atm

(d) 273°C and 2 atm

## Answer

C

**Question. Diffusion of helium gas is four times faster, than **

(a) CO_{2}

(b) SO_{2}

(c) NO_{2}

(d) O_{2 }

## Answer

B

**Question. 6.4 g of SO _{2} at 0°C and 0.99 atm pressure occupies a volume of 2.241 L. Predict which of the following is CO_{1} Tect? **

(a) The gas is ideal

(b) The gas is real with inte1molecular attraction

(c) The gas is real without intermolecular repulsion

(d) The gas is real with inte1molecular repulsion greater than intermolecular attraction

## Answer

A

**Question. The pressure and temperature of 4 dm ^{3} of carbon dioxide gas are doubled, then the volume of carbon dioxide gas would be **

(a) 2dm

^{3}

(b) 3dm

^{3}

(c) 4dm

^{3}

(d) 8dm

^{3}

## Answer

C

**Question. A gas ofunknown identity effuses at the rate 83.3 mLs ^{-1}, in an effusion apparatus in which carbon dioxide effuses at the rate of 102 mLs^{-1}, . Calculate molar mass of the unknown gas. **

(a) 6.597 g mol

^{-1}

(b) 65.97 g mol

^{-1}

(c) 3.650 g mol

^{-1}(d) 36.50 g mol

^{-1 }

## Answer

B

**Question. A, Band Care ideal gases. Their molecular weights are 2, 4 and 28, respectively. The rate of diffusion of these gases follow the order **

(a) C > A > B

(b) C > B > A

(c) A = B = C

(d) A > B > C

## Answer

D

**Question. The root mean square velocity of a gas is doubled when temperature is **

(a) increased four times

(b) increased two times

(c) reduced to half

(d) reduced to one-fourth

## Answer

A

**Question. Charles’ law is represented mathematically as **

(a) V_{1} = KV_{0}t

(b) V_{1} = KV_{0}/t

(c) V_{1} = V_{0} (1 + 273/t)

(d) V_{1} = V_{0} (1 + t/273)

## Answer

D

**Question. A gaseous mixture contains 56 g of N _{2} , 44 g of CO_{2} and 16 g of CH_{4} . The total pressure of mixture is 720 mm of Hg. The partial pressure of methane is**

(a) 75atm

(b) 160atm

(c) 180atm

(d) 215atm

## Answer

C

**Question. If both oxygen and helium gases are at the same temperature, the rate of diffusion of O _{2} is very close to**

(a) 4 times that of He

(b) 2 times that of He

(c) 0.35 times that of He

(d) 8 times that of He

## Answer

C

**Question. 10 g each of CH _{4} and O_{2} are kept in cylinders of same volume under same temperature, give the pressure ratio of two gases. **

(a) 2 :1

(b) 1:4

(c) 2:3

(d) 3:4

## Answer

A

**Question. The ratio of the rate of diffusion of helium and methane under identical condition of pressure and temperature will be **

(a) 4

(b) 0.2

(c) 2

(d) 0.5

## Answer

C

**Question. Graham’s law deals with the relation between **

(a) pressure and volume

(b) density and rate of diffusion

(c) rate of diffusion and volume

(d) rate of diffusion and viscosity

## Answer

B

**Question. The molecular velocity of any gas is**

(a) inversely proportional to the square root of temperature

(b) inversely proportional to absolute temperature

(c) directly proportional to square of temperature

(d) directly proportional to square root of temperature

## Answer

C

**Question. Calculate the total pressure in a 10.0 L cylinder which contains 0.4 g heliwn, 1.6 g oxygen and 1.6 nitrogen at 27°C.**

(a) 0.492 atm

(b) 49.2 atm

(c) 4.92 atm

(d) 0.0492 atm

## Answer

A

**Question. In order to increase the volume of a gas by 10%, the pressure of the gas should be**

(a) increased by 10%

(b) increased by 1 %

(c) decreased by 10%

(d) decreased by 1 %

## Answer

C

**Question. Which gas has the highest partial pressure atmosphere?**

(a) CO_{2}

(b) H_{2}O

(c) O_{2}

(d) N_{2 }

## Answer

D

**Question. Which one of the following statements is not correct about the effect of an increase in temperature on the clistribution of molecular speeds in a gas? **

(a) The area under the clistribution curve remains the same as under the lower temperature

(b) The clistribution becomes broader

(c) The fraction of the molecules with the most probable speed increases

(d) The most probable speed increases

## Answer

C

**Question. Ratio of average to most probable velocity is**

(a) 1.128

(b) 1.224

(c) 1.0

(d) 1.112

## Answer

A

**Question. If the absolute temperature of a gas is doubled and the pressure is reduced to one half, then the volume of the gas will **

(a) remain unchanged

(b) be doubled

(c) increase four fold

(d) be halved

## Answer

C

**Question. To what temperature must a neon gas sample be heated to double its pressure, if the initial volume of gas at 75°C is decreased by 15.0%? **

(a) 319°C

(b) 592°C

(c) 128°C

(d) 60°C

## Answer

D

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