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# NCERT solutions for Class 11 Chemistry chapter 5 - States of Matter

## Chemistry Textbook for Class 11

#### NCERT Chemistry Class 11 ## Chapter 5: States of Matter

#### Chapter 5: States of Matter solutions [Pages 152 - 153]

Q 1 | Page 152

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

Q 2 | Page 153

A vessel of 120 mL capacity contains a certain amount of gas at 35 °C and 1.2 bar pressure. The gas is transferred to another vessel of volume 180 mL at 35 °C. What would be its pressure?

Q 3 | Page 153

Using the equation of state pV nRT; show that at a given temperature density of a gas is proportional to gas pressurep.

Q 4 | Page 153

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

Q 5 | Page 153

The pressure of 1 g of an ideal gas A at 27 °C is found to be 2 bar. When 2 g of another ideal gas B is introduced in the same flask at the same temperature the pressure becomes 3 bar. Find a relationship between their molecular masses.

Q 6 | Page 153

The drain cleaner, Drainex contains small bits of aluminum which react with caustic soda to produce dihydrogen. What volume of dihydrogen at 20 °C and one bar will be released when 0.15g of aluminum reacts?

Q 7 | Page 153

What will be the pressure exerted by a mixture of 3.2 g of methane and 4.4 g of carbon dioxide contained in a 9 dm3 flask at 27 °C ?

Q 8 | Page 153

What will be the pressure of the gaseous mixture when 0.5 L of H2 at 0.8 bar and 2.0 L of dioxygen at 0.7 bar are introduced in a 1L vessel at 27°C?

Q 9 | Page 153

The density of a gas is found to be 5.46 g/dm3 at 27 °C at 2 bar pressure. What will be its density at STP?

Q 10 | Page 153

34.05 mL of phosphorus vapour weighs 0.0625 g at 546 °C and 0.1 bar pressure. What is the molar mass of phosphorus?

Q 11 | Page 153

A student forgot to add the reaction mixture to the round-bottomed flask at 27 °C but instead, he/she placed the flask on the flame. After a lapse of time, he realized his mistake and using a pyrometer he found the temperature of the flask was 477 °C. What fraction of air would have been expelled out?

Q 12 | Page 153

Calculate the temperature of 4.0 mol of a gas occupying 5 dmat 3.32 bar.

(R = 0.083 bar dm3 K–1 mol–1).

Q 13 | Page 153

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

Q 14 | Page 153

How much time would it take to distribute one Avogadro number of wheat grains, if 1010 grains are distributed each second?

Q 15 | Page 153

Calculate the total pressure in a mixture of 8 g of dioxygen and 4 g of dihydrogen confined in a vessel of 1 dm3 at 27°C. R = 0.083 bar dm3 K1 mol1.

Q 16 | Page 153

Payload is defined as the difference between the mass of displaced air and the mass of the balloon. Calculate the payload when a balloon of radius 10 m, mass 100 kg is filled with helium at 1.66 bar at 27°C. (Density of air = 1.2 kg m3 and R = 0.083 bar dm3 K1 mol1).

Q 17 | Page 153

Calculate the volume occupied by 8.8 g of CO2 at 31.1°C and 1 bar pressure.

R = 0.083 bar L K–1 mol–1.

Q 18 | Page 153

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

Q 19 | Page 153

A mixture of dihydrogen and dioxygen at one bar pressure contains 20% by weight of dihydrogen. Calculate the partial pressure of dihydrogen.

Q 20 | Page 153

What would be the SI unit for the quantity pV22/n?

Q 21 | Page 153

In terms of Charles’ law explain why –273°C is the lowest possible temperature.

Q 22 | Page 153

The critical temperature  for carbon dioxide and methane are 31.1 °C and –81.9 °C respectively. Which of these has stronger intermolecular forces and why?

Q 23 | Page 153

Explain the physical significance of Van der Waals parameters.

## Chapter 5: States of Matter

#### NCERT Chemistry Class 11 ## NCERT solutions for Class 11 Chemistry chapter 5 - States of Matter

NCERT solutions for Class 11 Chemistry chapter 5 (States of Matter) 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 CBSE Chemistry Textbook for Class 11 solutions in a manner that help students grasp basic concepts better and faster.

Further, we at Shaalaa.com are providing such solutions so that students can prepare for written exams. NCERT textbook solutions can be a core help for self-study and acts as a perfect self-help guidance for students.

Concepts covered in Class 11 Chemistry chapter 5 States of Matter are Intermolecular Forces - Introduction, Dispersion Forces Or London Forces, Dipole - Dipole Forces, Dipole-induced Dipole Forces, Hydrogen Bond, Thermal Energy, Intermolecular Forces Vs. Thermal Interactions, The Gaseous State, Boyle’S Law (Pressure - Volume Relationship), Charles’ Law (Temperature - Volume Relationship), Gay Lussac’S Law (Pressure- Temperature Relationship), Avogadro Law, Derivation of Ideal Gas Equation, Density and Molar Mass of a Gaseous Substance, Dalton’S Law of Partial Pressures, Kinetic Molecular Theory of Gases, Behaviour of Real Gases:- Deviation from Ideal Gas Behaviour, Liquifaction of Gases, Vapour Pressure, Surface Tension, Viscosity, States of Matter:- Gases and Liquids Numericals.

Using NCERT Class 11 solutions States of Matter exercise by students are an easy way to prepare for the exams, as they involve solutions arranged chapter-wise also page wise. The questions involved in NCERT Solutions are important questions that can be asked in the final exam. Maximum students of CBSE Class 11 prefer NCERT Textbook Solutions to score more in exam.

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