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Gas - Practice Questions & MCQ
Updated on Sep 18, 2023 18:35 AM | #JEE Main
Quick Facts
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5 Questions around this concept.
Solve by difficulty
Which of the following statements is correct?
(a) The unit of k in the expression $\mathrm{V}=\mathrm{kT}$ is $\mathrm{m}^3 \mathrm{k}^{-1}$.
(b) A gas is heated at constant pressure from $25^{\circ} \mathrm{C}$ to $50^{\circ} \mathrm{C}$. It expands to twice its initial volume.
(c) The volume occupied by 32 g of oxygen is greater than that occupied by 16 g of methane, both being at the same $T$ and p.
(d) All real gases can be liquefied below their critical temperature.
Gases possess characteristic critical temperature which depends upon the magnitude of intermolecular forces between the particles. Following are the critical temperatures of some gases.
|
Gases |
H2 |
He |
O2 |
N2 |
|
Critical temperature in Kelvin |
33.2 |
5.3 |
154.3 |
126 |
From the above data what would be the order of liquefaction of these gases? Start writing the order from the gas liquefying first
With regard to the gaseous state of matter which of the following statements are correct?
(i) Complete order of molecules
(ii) Complete disorder of molecules
(iii) Random motion of molecules
(iv) Fixed position of molecules
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Concepts Covered - 0
The Gaseous State and Characteristics of Gas
The Gaseous State
Gases and their properties play an important role in our daily lives. Our atmosphere consists Of mixture Of gases like dioxygen, dinitrogen, carbon dioxide, water vapours etc. These gases shield us from harmful radiations. Life is supported by the dioxygen in the air which we breathe. Plants need carbon dioxide for photosynthesis.
There are in total eleven elements in the periodic table which exist as gases under normal conditions.
Composition of gases is always from non-metal eg. etc.
Following are the few physical properties of gaseous state :
(i) The volume and shape of gases is not fixed. These assume the volume and shape of the container.
(ii) The thermal energy of gases >> molecular attraction.
(iii) Gases have infinite expansibility and high compressibility.
(iv) Gases exert pressure equally in all directions
(v) Gases have much lower density than the solids and liquids due to negligible intermolecular forces.
vi) Gas mix evenly with other gases or their mixtures are homogeneous in composition.
Characteristics of Gas
There are certain parameters or measurable properties which are used to describe the characteristics of gases
- Volume (V): The volume of the container is the volume of the gas sample as gases occupy the entire space available to them.
- Pressure (P): Pressure Of the gas is the force exerted by the gas per unit area on the walls of the container in all directions.
- Temperature: It is the measure of hotness of the system and energy of the system.
- Mass: The mass of a gas can be determined by weighing the container in which the gas is enclosed and again weighing the container after removing the gas. The mass of the gas is related to the number of moles of the gas i.e.
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