Question:

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R
Assertion (A): On cooling, ammonia liquifies first whereas \(CO_{2}\) requires more cooling. 

Reason (R): Critical temperatures of ammonia and carbon dioxide are \(405.5 K\) and \(304.10 K\) respectively.

In the light of the above statements, choose the correct answer from the options given below

Updated On: Apr 3, 2023
  • If both assertion and reason are true and reason is the correct explanation of assertion.
  • If both assertion and reason are true but reason is not the correct explanation of assertion.
  • If assertion is true but reason is false.
  • If both assertion and reason are false.
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The Correct Option is A

Solution and Explanation

For liquification, critical temperature is checked. critical temperature is defined as the temperature above which gas cannot be liquified no matter how much the pressure is increased. for Ammonia, critical temperature is $405.5\, K$ and for $CO _{2}$ the critical temperature is $304 \cdot 10\, K$ critical temperature of Ammonia is greater than critical temperature of $CO _{2}$ $\therefore$ on coding Ammonia liquifies first whereas $CO _{2}$ requires more cooling
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Notes on States of matter

Concepts Used:

States of Matter

The matter is made up of very tiny particles and these particles are so small that we cannot see them with naked eyes.

There are three States of Matter:

The three states of matter are as follows:

Solid State:

  • The solid-state is one of the fundamental states of matter.
  • Solids differ from liquids and gases by the characteristic of rigidity.
  • The molecules of solids are tightly packed because of strong intermolecular forces; they only oscillate about their mean positions.

Liquid State:

  • The molecules in a liquid are closely packed due to weak intermolecular forces.
  • These forces are weaker than solids but stronger than that of gases.
  • There is much space in between the molecules of liquids which makes their flowing ability easy.

Gaseous State:

  • In this state of matter, distances between the molecules are large (intermolecular distance is in the range of 10-7-10-5 cm.
  • The intermolecular forces experienced between them are negligible.
  • Thus, translatory, rotatory and vibratory motions are observed prominently in gases.