Study of Gas Laws Goyal Brother Solutions ICSE Class-9 Ch-7. We Provide Answer related to Characteristics of Gases, Gas Law, Boyle’s Law, Charles Law with Numericals questions.. Visit official Website CISCE for detail information about ICSE Board Class-9.

**Ch-7 Study of Gas Laws Goyal Brother Solutions ICSE Class-9 Chemistry **

Board | ICSE |

Publications | Goyal Brother Prakashan |

Subject | Chemistry |

Class | 9th |

Writer | Dr. S.K. Aggarwal |

Chapter-7 | Study of Gas Laws |

Topics | Solutions of Exercises-7 |

Edition | for 2022-2023 Academic Session |

**Ch-7 Study of Gas Laws **

Goyal Brother Prakashan ICSE Class-9 Chemistry Solutions

(Page- 146-147)

**Questions 1. Give one word / one line answer for the following:**

(a) Volume of a gas compared to its solid state—Less than

(b) The law which gives relationship between volume and temperature of gas at constant pressure—Charles Law.

(c) The law which gives relationship between volume and pressure of gas at constant temperature—Boyle’s Law

(d) An equation which gives relationship between volume, pressure and temperature of the gas in kelvin.–Gas Law

(e) Charles’ law equation. V1/T1 = V2/T2

(f) Boyle’s law equation. P1V1 / P2V2

(g) Gas equation(.P1V1/T1) = (P2V2/T2)

(h) Standard temperature of a gas in kelvin–273

(i) Standard pressure of a gas in mm of Hg–760mm

(j) Volume of a gas at -273 °C—0 cc

(k) Intermixing of gases to form a homogeneous mixture.–Diffusion

(l) Absolute temperature of a gas at 0 °C.—1/273 of Initial

(m) Celsius temperature of a gas at 300 K.–300-273-27 °C

**Questions 2. **Briefly explain the following:

**(a) Volumes of different gases are converted to S.T.P. before comparing their densities.**

Ans: Since volumes of gases change with temperature and pressure, a standard value of temperature and pressuure is chosen to which gas volumes are referred. Hence volumes of gases are converted into S.T.P. conditions and then compared easily

**(b) Lower density of the gases as compared to solids–**

Ans:- Intermolecular gaps in gases are vast. In comparison to solids and liquids, the number of molecules per unit volume in gas is extremely low. As a result, their densities are low

**(c) volume of a gas is always equal to volume of container in which it is held.**

Ans:- Gas particles fill the space that is available; hence; the shape and the volume of the gas depend on its container

**(d) Kelvin temperature is always positive.**

Ans:- Kelvin is the SI base unit of temperature. It is given the symbol . Since temperature measures the energy of atoms and molecules, a true temperature scale must be a positive scale since atoms cannot have a negative energy

**(e) The product of pressure and volume of an enclosed dry gas at a given temperature is always a constant quantity.**

Ans: The relation between pressure and volume at constant temperature is best described As Boyle’s Law, which says that at constant temperature, the pressure of a fixed amount of gas is inversely proportional to its volume. Or in other words we can say that the product of pressure and volume is constant, pV = constant

**(f) Gases exert same pressure in all direction.**

Ans:- The gas particles have very weak attractive force between them, and move randomly ultimately exert pressure in all direction. Their molecules are bouncing all around the container because they are so small, then gravity has very little effect on them

**(g) Temperature -273 °C is a theoretical temperature, but cannot be achieved.**

Ans: At zero kelvin (minus 273 degrees Celsius) the particles stop moving and all disorder disappears. Thus, nothing can be colder than absolute zero on the Kelvin scale.

— End of Study of Gas Laws Goyal Brother Solutions ICSE Class-9 Ch-7 :–

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