Tamil Nadu Board of Secondary EducationHSC Science Class 11th

# Tamil Nadu Board Samacheer Kalvi solutions for Class 11th Chemistry Volume 1 and 2 Answers Guide chapter 6 - Gaseous State [Latest edition]

## Chapter 6: Gaseous State

Choose the best answer [Pages 178 - 181]

### Tamil Nadu Board Samacheer Kalvi solutions for Class 11th Chemistry Volume 1 and 2 Answers Guide Chapter 6 Gaseous StateChoose the best answer [Pages 178 - 181]

Choose the best answer | Q I. 1. | Page 178

Gases deviate from ideal behavior at high pressure. Which of the following statement(s) is correct for non-ideality?

• at high pressure the collision between the gas molecule become enormous

• at high pressure the gas molecules move only in one direction

• at high pressure, the volume of gas become insignificant

• at high pressure the intermolecular interactions become significant

Choose the best answer | Q I. 2. | Page 178

Rate of diffusion of a gas is

• directly proportional to its density

• directly proportional to its molecular weight

• directly proportional to its square root of its molecular weight

• inversely proportional to the square root of its molecular weight

Choose the best answer | Q I. 3. | Page 178

Which of the following is the correct expression for the equation of state of van der Waals gas?

• ["P" + "a"/("n"^2"V"^2)]("V" - "nb") = "nRT"

• ["P" + "na"/("n"^2"V"^2)]("V" - "nb") = "nRT"

• ["P" + "an"^2/("V"^2)]("V" - "nb") = "nRT"

• ["P" + ("n"^2"a"^2)/("V"^2)]("V" - "nb") = "nRT"

Choose the best answer | Q I. 4. | Page 178

When an ideal gas undergoes unrestrained expansion, no cooling occurs because the molecules

• are above inversion temperature

• exert no attractive forces on each other

• do work equal to the loss in kinetic energy

• collide without loss of energy

Choose the best answer | Q I. 5. | Page 178

Equal weights of methane and oxygen are mixed in an empty container at 298 K. The fraction of total pressure exerted by oxygen is

• 1/3

• 1/2

• 2/3

• 1/3 xx 273 xx 298

Choose the best answer | Q I. 6. | Page 179

The temperatures at which real gases obey the ideal gas laws over a wide range of pressure is called __________.

• Critical temperature

• Boyle temperature

• Inversion temperature

• Reduced temperature

Choose the best answer | Q I. 7. | Page 179

In a closed room of 1000 m3 a perfume bottle is opened up. The room develops a smell. This is due to which property of gases?

• Viscosity

• Density

• Diffusion

• None

Choose the best answer | Q I. 8. | Page 179

A bottle of ammonia and a bottle of HCl connected through a long tube are opened simultaneously at both ends. The white ammonium chloride ring first formed will be

• At the center of the tube

• Near the hydrogen chloride bottle

• Near the ammonia bottle

• Throughout the length of the tube

Choose the best answer | Q I. 9. | Page 179

The value of the universal gas constant depends upon

• Temperature of the gas

• Volume of the gas

• Number of moles of the gas

• Units of pressure and volume

Choose the best answer | Q I. 10. | Page 179

The value of the gas constant R is

• 0.082 dm3 atm

• 0.987 cal mol-1 K-1

• 8.3 J mol-1 K-1

• 8 erg mol-1 K-1

Choose the best answer | Q I. 11. | Page 179

Use of hot air balloon in sports and meteorological observation is an application of

• Boyle’s law

• Newton’s law

• Kelvin’s law

• Brown’s law

Choose the best answer | Q I. 12. | Page 179

The table indicates the value of van der Waals constant ‘a’ in (dm3)2 atm. mol-2

 Gas O2 N2 NH3 CH4 a 1.360 1.390 4.170 2.253

The gas which can be most easily liquefied is

• O2

• N2

• NH3

• CH4

Choose the best answer | Q I. 13. | Page 180

Consider the following statements

i) Atmospheric pressure is less at the top of a mountain than at sea level

ii) Gases are much more compressible than solids or liquids

iii) When the atmospheric pressure increases the height of the mercury column rises

Select the correct statement

• i and ii

• ii and iii

• i and iii

• i, ii and iii

Choose the best answer | Q I. 14. | Page 180

Compressibility factor for CO2 at 400 K and 71.0 bar is 0.8697. The molar volume of CO2 under these conditions is

• 22.04 dm3

• 2.24 dm3

• 0.41 dm3

• 19.5 dm3

Choose the best answer | Q I. 15. | Page 180

If the temperature and volume of an ideal gas is increased to twice its values, the initial pressure P becomes

• 4P

• 2P

• P

• 3P

Choose the best answer | Q I. 16. | Page 180

At identical temperature and pressure, the rate of diffusion of hydrogen gas is 3sqrt3 times that of a hydrocarbon having molecular formula CnH2n–2. What is the value of n?

• 8

• 4

• 3

• 1

Choose the best answer | Q I. 17. | Page 180

Equal moles of hydrogen and oxygen gases are placed in a container, with a pin-hole through which both can escape what fraction of oxygen escapes in the time required for one-half of the hydrogen to escape.

• 3/8

• 1/2

• 1/8

• 1/4

Choose the best answer | Q I. 18. | Page 180

The variation of volume V, with temperature T, keeping the pressure constant is called the coefficient of thermal expansion ie α = 1/"V"((∂"V")/(∂"T"))_"P". For an ideal gas α is equal to

• T

• 1/"T"

• P

• none of these

Choose the best answer | Q I. 19. | Page 180

Four gases P, Q, R and S have almost the same values of 'b' but their 'a' values (a, b are Van der Waals Constants) are in the order Q < R < S < P. At a particular temperature, among the four gases, the most easily liquefiable one is

• P

• Q

• R

• S

Choose the best answer | Q I. 20. | Page 180

Maximum deviation from ideal gas is expected from

• $\ce{CH4_{(g)}}$

• $\ce{NH3_{(g)}}$

• $\ce{H2_{(g)}}$

• $\ce{N2_{(g)}}$

Choose the best answer | Q I. 21. | Page 180

The units of Van der Waals constants 'b' and 'a' respectively

• mol L-1 and L atm2 mol-1

• mol L and L atm mol2

• mol-1 L and L2 atm mol-2

• none of these

Choose the best answer | Q I. 22. | Page 181

Assertion: Critical temperature of CO2 is 304 K, it can be liquefied above 304 K.

Reason: For a given mass of gas, volume is to directly proportional to pressure at constant temperature

• both assertion and reason are true and reason is the correct explanation of assertion

• both assertion and reason are true but reason is not the correct explanation of assertion

• assertion is true but reason is false

• both assertion and reason are false

Choose the best answer | Q I. 23. | Page 181

What is the density of N2 gas at 227°C and 5.00 atm pressure? (R = 0.082 L atm K–1 mol–1)

• 1.40 g/L

• 2.81 g/L

• 3.41 g/L

• 0.29 g/L

Choose the best answer | Q I. 24. | Page 181

Which of the following diagrams correctly describes the behaviour of a fixed mass of an ideal gas? (T is measured in K)

• All of these

Choose the best answer | Q I. 25. | Page 181

25 g of each of the following gases are taken at 27°C and 600 mm Hg pressure. Which of these will have the least volume?

• HBr

• HCl

• HF

• HI

Write brief answer to the following questions [Pages 182 - 183]

### Tamil Nadu Board Samacheer Kalvi solutions for Class 11th Chemistry Volume 1 and 2 Answers Guide Chapter 6 Gaseous StateWrite brief answer to the following questions [Pages 182 - 183]

Write brief answer to the following questions | Q II. 1. | Page 182

State Boyle's law.

Write brief answer to the following questions | Q II. 2. | Page 182

Name two items that can serve as a model for Gay Lusaac’s law and explain.

Write brief answer to the following questions | Q II. 3. | Page 182

Give the mathematical expression that relates gas volume and moles.

Write brief answer to the following questions | Q II. 4. | Page 182

What are ideal gases?

Write brief answer to the following questions | Q II. 4. | Page 182

In what way real gases differ from ideal gases.

Write brief answer to the following questions | Q II. 5. | Page 182

Can a Van der Waals gas with a = 0 be liquefied? explain.

Write brief answer to the following questions | Q II. 6. | Page 182

Suppose there is a tiny sticky area on the wall of a container of gas. Molecules hitting this area stick there permanently. Is the pressure greater or less than on the ordinary area of walls?

Write brief answer to the following questions | Q II. 7. a) | Page 182

Explain the following observation.

Aerated water bottles are kept under water during summer

Write brief answer to the following questions | Q II. 7. b) | Page 182

Explain the following observation.

Liquid ammonia bottle is cooled before opening the seal

Write brief answer to the following questions | Q II. 7. c) | Page 182

Explain the following observation.

The type of an automobile is inflated to slightly lesser pressure in summer than in winter

Write brief answer to the following questions | Q II. 7. d) | Page 182

Explain the following observation.

The size of a weather balloon becomes larger and larger as it ascends up to larger altitude

Write brief answer to the following questions | Q II. 8. a) | Page 182

Give a suitable explanation for the following facts about gases.

Gases don’t settle at the bottom of a container

Write brief answer to the following questions | Q II. 8. b) | Page 182

Give a suitable explanation for the following facts about gases.

Gases diffuse through all the space available to them

Write brief answer to the following questions | Q II. 9. | Page 182

Suggest why there is no hydrogen (H2) in our atmosphere. Why does the moon have no atmosphere?

Write brief answer to the following questions | Q II. 10. a) | Page 182

Explain whether a gas approaches ideal behavior or deviates from ideal behaviour if it is compressed to a smaller volume at a constant temperature.

Write brief answer to the following questions | Q II. 10. b) | Page 182

Explain whether a gas approaches ideal behavior or deviates from ideal behaviour if the temperature is raised while keeping the volume constant.

Write brief answer to the following questions | Q II. 10. c) | Page 182

Explain whether a gas approaches ideal behavior or deviates from ideal behaviour if more gas is introduced into the same volume and at the same temperature.

Write brief answer to the following questions | Q II. 11. | Page 182

Which of the following gases would you expect to deviate from ideal behavior under conditions of low-temperature F2, Cl2, or Br2? Explain.

Write brief answer to the following questions | Q II. 12. | Page 182

Distinguish between diffusion and effusion.

Write brief answer to the following questions | Q II. 13. | Page 182

Aerosol cans carry a clear warning of the heating of the can. Why?

Write brief answer to the following questions | Q II. 14. | Page 182

Would it be easier to drink water with a straw on the top of Mount Everest?

Write brief answer to the following questions | Q II. 15. | Page 182

Write the Van der Waals equation for a real gas. Explain the correction term for pressure and volume.

Write brief answer to the following questions | Q II. 16. | Page 182

Derive the values of critical constants in terms of van der Waals constants.

Write brief answer to the following questions | Q II. 17. | Page 182

Why do astronauts have to wear protective suits when they are on the surface of the moon?

Write brief answer to the following questions | Q II. 18. | Page 182

When ammonia combines with HCl, NH4Cl is formed as white dense fumes. Why do more fumes appear near HCl?

Write brief answer to the following questions | Q II. 19. | Page 183

A sample of gas at 15°C at 1 atm. has a volume of 2.58 dm3. When the temperature is raised to 38°C at 1 atm does the volume of the gas Increase? If so, calculate the final volume.

Write brief answer to the following questions | Q II. 20. | Page 183

A sample of gas has a volume of 8.5 dm3 at an unknown temperature. When the sample is submerged in ice water at 0°C, its volume gets reduced to 6.37 dm3. What is its initial temperature?

Write brief answer to the following questions | Q II. 21. | Page 183

Of two samples of nitrogen gas, sample A contains 1.5 moles of nitrogen in a vessel of the volume of 37.6 dm3 at 298 K, and sample B is in a vessel of volume 16.5 dm3 at 298 K. Calculate the number of moles in sample B.

Write brief answer to the following questions | Q II. 22. | Page 183

Sulphur hexafluoride is a colourless, odourless gas; calculate the pressure exerted by 1.82 moles of the gas in a steel vessel of volume 5.43 dm3 at 69.5 °C, assuming ideal gas behaviour

Write brief answer to the following questions | Q II. 23. | Page 183

Argon is an inert gas used in light bulbs to retard the vaporization of the tungsten filament. A certain light bulb containing argon at 1.2 atm and 18°C is heated to 85°C at constant volume. Calculate its final pressure in atm.

Write brief answer to the following questions | Q II. 24. | Page 183

A small bubble rises from the bottom of a lake where the temperature and pressure are 6°C and 4 atm. to the water surface, where the temperature is 25°C and pressure is 1 atm. Calculate the final volume in (mL) of the bubble, if its initial volume is 1.5 mL.

Write brief answer to the following questions | Q II. 25. | Page 183

Hydrochloric acid is treated with a metal to produce hydrogen gas. Suppose a student carries out this reaction and collects a volume of 154.4 × 10−3 dm3 of a gas at a pressure of 742 mm of Hg at a temperature of 298 K. What mass of hydrogen gas (in mg) did the student collect?

Write brief answer to the following questions | Q II. 26. | Page 183

It takes 192 sec for an unknown gas to diffuse through a porous wall and 84 sec for N2 gas to effuse at the same temperature and pressure. What is the molar mass of the unknown gas?

Write brief answer to the following questions | Q II. 27. | Page 183

A tank contains a mixture of 52.5 g of oxygen and 65.1 g of CO2 at 300 K the total pressure in the tanks is 9.21 atm. Calculate the partial pressure (in atm.) of each gas in the mixture.

Write brief answer to the following questions | Q II. 28. | Page 183

A combustible gas is stored in a metal tank at a pressure of 2.98 atm at 25°C. The tank can withstand a maximum pressure of 12 atm after which it will explode. The building in which the tank has been stored catches fire. Now predict whether the tank will blow up first or start melting? (Melting point of the metal = 1100 K).

## Tamil Nadu Board Samacheer Kalvi solutions for Class 11th Chemistry Volume 1 and 2 Answers Guide chapter 6 - Gaseous State

Tamil Nadu Board Samacheer Kalvi solutions for Class 11th Chemistry Volume 1 and 2 Answers Guide chapter 6 (Gaseous State) include all questions with solution and detail explanation. This will clear students doubts about any question and improve application skills while preparing for board exams. The detailed, step-by-step solutions will help you understand the concepts better and clear your confusions, if any. Shaalaa.com has the Tamil Nadu Board of Secondary Education Class 11th Chemistry Volume 1 and 2 Answers Guide solutions in a manner that help students grasp basic concepts better and faster.

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Concepts covered in Class 11th Chemistry Volume 1 and 2 Answers Guide chapter 6 Gaseous State are Mixture of Gases - Dalton’S Law of Partial Pressures, Derivation of Critical Constants from Van Der Waals Constant, Behaviour of Real Gases:- Deviation from Ideal Gas Behaviour, The Gaseous State, The Gas Laws, Ideal Gas Equation, Liquefaction of Gases and Critical Constant.

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