#### Chapters

Chapter 2: Chemical Changes & Reactions

Chapter 3: Water

Chapter 4: Atomic Structure & Chemical Bonding

Chapter 5: The Periodic Table

Chapter 6: Study Of The First Element — Hydrogen

Chapter 7: Study Of Gas Laws

Chapter 8: Atmospheric Pollution

Chapter 9: Practical Chemistry

## Chapter 7: Study Of Gas Laws

#### Exercise

### Viraf J. Dalal solutions for Class 9 Simplified ICSE Chemistry Chapter 7 Study Of Gas Laws Exercise

When stating the volume of a gas, the pressure and temperature should also be given. Why?

Is it possible to change the temperature and pressure of a fixed mass of a gas without changing its volume? Explain your answer.

State Boyle's Law.

A fixed volume of a gas occupies 760cm^{3} at 27° C and 70cm of Hg. What will be its vol. at s.t.p.

At 0°C and 760 mm Hg pressure, a gas occupies a volume of 10Q cm^{3}. The Kelvin temperature (Absolute temperature) of the gas is increased by one-fifth while the pressure is increased one and a half times. Calculate the final volume of the gas. [80 cc.]

The pressure on one mole of gas at s.t.p. is doubled and the temperature is raised to 546 K. What is the final volume of the gas ? [one mole of a gas occupies a volume of 22.4 litres at stp.]

State Boyle's Law.

Express Kelvin Zero in °C

#### Additional Questions

### Viraf J. Dalal solutions for Class 9 Simplified ICSE Chemistry Chapter 7 Study Of Gas Laws Additional Questions

What volume will a gas occupy at 740 mm pressure which at 1480 nun occupies 500 cc? [Temperature being constant]

The volume of a given mass of a gas at 27°C is 100 cc. To what temperature should it be heated at the same pressure so that it will occupy a volume of 150 cc?

A fixed mass of a gas has a volume of 750 cc at—23°C and 800 mm pressure. Calculate the pressure for which its volume will be 720 cc. The temperature being - 3°C.

What temperature would be necessary to double the volume of a gas initially at s.t.p. if the pressure is decreased by 50%?

A gas cylinder having a capacity of 20 litres contains a gas at 100 atmos. How many flasks of 200 cm^{3} capacity can be filled from it at 1 atmos. pressure if the temperature remains constant?

A certain mass of gas occupied 850 ml at a pressure of 760 mm of Hg. On increasing the pressure it was found that the volume of the gas was 75% of its initial value. Assuming constant temperature, find the final pressure of the gas?

It is required to reduce the volume of a gas by 20% by compressing it at a constant pressure. To do so, the gas has to be cooled. If the gas attains a final temperature of 157°C, find the initial temperature of the gas?

At a given temperature the pressure of a gas reduces to 75% of its initial value and the volume increases by 40% of its initial value. Find this temperature if the initial temperature was -10°C.

#### Study Of Gas Laws

### Viraf J. Dalal solutions for Class 9 Simplified ICSE Chemistry Chapter 7 Study Of Gas Laws Study Of Gas Laws

**Name or state the following:**

The law which states that pressure remaining constant the volume of a given mass of dry gas is directly proportional to its absolute [Kelvin] temperature.

**Name or state the following:**

The law which states that pressure remaining constant the volume of a given mass of dry gas is directly proportional to its absolute [Kelvin] temperature.

**Name or state the following:**

An equation used in chemical calculations which gives a simultaneous effect of changes of temperature and pressure on the volume of a given mass of dry gas

**Name or state the following:**

The standard pressure of a gas in cm. of mercury corresponding to one atmospheric pressure.

**Name or state the following:**

The absolute temperature value corresponding to 35°C.

**Give reason for the following:**

Gases exert pressure in all directions.

**Give reason for the following:**

Gases have a lower density compared to solids or liquids.

**Give reason for the following:**

Temperature remaining constant the product of the vol. & the press, of a given mass of dry gas is a constant.

**Give reason for the following:**

All temperatures in the absolute (Kelvin) scale is in positive figures.

**Give reason for the following:**

Volumes of gases are converted into s.t.p. conditions and then compared.

**Calculate the following:**

Calculate the temperature to which a gas must be heated, so that the volume triples without any change in pressure. The gas is originally at 57”C and having a volume 150 cc.

**Calculate the following:**

A gas ‘X’ at -33°C is heated to 127° C at constant pressure. Calculate the percentage increase in the volume of the gas.

**Calculate the following:**

Calculate the volume of a gas ‘A’ at s.t.p., if at 37°C and 775 mm of mercury pressure, it occupies a volume of `9 1/2` litres.

**Calculate the following:**

Calculate the temperature at which a gas ‘A’ at 20°C having a volume, of 500 cc. will occupy a volume of 250 cc.

**Calculate the following:**

A gas ‘X’ is collected over water at 17°C and 750 mm. pressure. If the volume of the gas collected is 50 cc., calculate the volume of the dry gas at s.t.p. [at 17°C the vapour pressure is 14 mm.]

**Assuming temperature remaining constant calculate the pressure of the gas in the following:**

The pressure of a gas having volume 1000 cc. originally occupying 1500 cc. at 720 mm. pressure.

**Assuming temperature remaining constant calculate the pressure of the gas in the following:**

The pressure of a gas having volume 100 lits. originally occupying 75 dm^{3} at 700 mm. pressure.

**Assuming temperature remaining constant calculate the pressure of the gas in the following:**

The pressure of a gas having volume 380 lits. originally occupying 800 cm^{3} at 76 cm. pressure.

**Assuming temperature remaining constant calculate the pressure of the gas in the following:**

The pressure of a gas having volume 1800 ml. originally occupying 300 ml. at 6 atms. pressure.

**Assuming temperature remaining constant calculate the pressure of the gas in the following:**

The pressure of a gas having volume 1500 cm^{3} originally occupying 750 cc. at 5 ats. pressure.

**Calculate the following:**

The temp, at which 500 cc. of a gas ‘X’ at temp. 293K occupies half it’s original volume [pressure constant].

**Calculate the following:**

The volume at s.t.p. occupied by a gas “Y” originally occupying 760 cc. at 300K and 70 cm. press, of Hg.

**Calculate the following:**

The volume at s.t.p. occupied by a gas ‘Z’ originally occupying 1.57 dm^{3} at 310.5K and 75 cm. press. of Hg.

**Calculate the following:**

The volume at s.t.p. occupied by a gas ‘Q’ originally occupying 153.7 cm^{3} at 287K and 750 mm. pressure [vapour pressure of gas ‘Q’ at 287K is 12 mm of Hg.]

**Calculate the following:**

The temperature to which a gas ‘P’ has to be heated to triple it’s volume, if the gas originally occupied 150 cm^{3} at 330K [pressure remaining constant].

**Fill in the blank with the correct word, from the words in option:**

If the temperature of a fixed mass of a gas is kept constant and the pressure is increased, the volume correspondingly _______.

increases

decreases

**Fill in the blank with the correct word, from the words in option:**

If the pressure of a fixed mass of a gas is kept constant and the temperature is increased, the volume correspondingly _______

increases

decreases

**Fill in the blank with the correct word, from the words in option:**

1 dm^{3} of a gas is equal to _______.

1 litre

100 ml.

100 cc.

**Fill in the blank with the correct word, from the words in option:**

All the temperature on the kelvin scale are in ____ figures.

negative

positive

**Fill in the blank with the correct word, from the words in option:**

At -273°C the volume of a gas is theoretically ______.

272 cc.

0 cc.

274 cc.

## Chapter 7: Study Of Gas Laws

## Viraf J. Dalal solutions for Class 9 Simplified ICSE Chemistry chapter 7 - Study Of Gas Laws

Viraf J. Dalal solutions for Class 9 Simplified ICSE Chemistry chapter 7 (Study Of Gas Laws) 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 CISCE Class 9 Simplified ICSE Chemistry solutions in a manner that help students grasp basic concepts better and faster.

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Concepts covered in Class 9 Simplified ICSE Chemistry chapter 7 Study Of Gas Laws are Behaviour and Characteristic Properties of Gases, Molecular Motion : Relationship of Temperature, Pressure and Volume, Derivation of Boyle’s Law, Van’t Hoff- Charles’ Law, Kelvin Scale of Temperature, The Gas Laws, Study of Gas Laws, Gas Equation (Pressure, Volume and Temperature Relationship), Conversion of Temperature from Celsius Scale to Kelvin Scale and Vice-versa, Standard Temperature and Pressure, Pressure and Volume Relationship in Gases, Absolute Zero, The Effect of Moisture and Pressure, Temperature - Volume Relationship in Gases, Molar Volume of a Gas at S.T.P, Mole Concept.

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