Question:
The normal boiling point of water is $100 \,^{\circ}C$ and standard boiling point of water is $99.6 \,^{\circ}C$.
The temperature at which vapour pressure of liquid is equal to the external pressure is called boiling temperature at that pressure.
The normal boiling point of water is $100 \,^{\circ}C$ and standard boiling point of water is $99.6 \,^{\circ}C$.
The temperature at which vapour pressure of liquid is equal to the external pressure is called boiling temperature at that pressure.
Updated On: Jul 6, 2022
- 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 B
Solution and Explanation
At $1$ atm pressure, boiling temperature is called normal boiling point and if pressure is $1$ bar then the boiling point is called standard boiling point of the liquid. $1$ bar pressure is slightly less than $1$ atm pressure therefore, standard boiling point of the liquid is slightly lower than the normal boiling point.
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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.