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Name the energy which arises due to motion of atoms or molecules in a body. How is this energy affected when the temperature is increased?
Name the energy which arises due to motion of atoms or molecules in a body. How is this energy affected when the temperature is increased?
This is a short answer type question as classified in NCERT Exemplar
The energy which arises due to motion of atoms or molecules in a body is known as thermal energy and the average kinetic energies of all the molecules increases with increases in temperature.
Upvote 
Pressure exerted by saturated water vapour is called aqueous tension. What correction term will you apply to the total pressure to obtain pressure of dry gas?
Pressure exerted by saturated water vapour is called aqueous tension. What correction term will you apply to the total pressure to obtain pressure of dry gas?
This is a short answer type question as classified in NCERT Exemplar
The gas collected over water, is moist and has saturated water vapour that exerts pressure which is known as aqueous tension. So the total pressure of the gas will be:
Pmoist gas = P dry gas &nbs
Upvote The magnitude of surface tension of liquid depends on the attractive forces between the molecules. Arrange the following in increasing order of surface tension : water, alcohol (C2H5OH) and hexane [CH3(CH2)4CH3].
The magnitude of surface tension of liquid depends on the attractive forces between the molecules. Arrange the following in increasing order of surface tension : water, alcohol (C2H5OH) and hexane [CH3(CH2)4CH3].
This is a short answer type question as classified in NCERT Exemplar
Water and alcohol are polar molecules which have high electronegative O atm so they have hydrogen bonding along with dipole-dipole interaction. Hexane is a nonpolar molecule that has London dispersion force&
Upvote One of the assumptions of kinetic theory of gases states that “there is no force of attraction between the molecules of a gas.” How far is this statement correct? Is it possible to liquefy an ideal gas? Explain.
One of the assumptions of kinetic theory of gases states that “there is no force of attraction between the molecules of a gas.” How far is this statement correct? Is it possible to liquefy an ideal gas? Explain.
This is a short answer type question as classified in NCERT Exemplar
The assumption of the kinetic theory of gases which states that- “ there is no force of attraction between the molecules of a gas. ” is a correct statement. Ideal gas has minimum force of attraction between the molecules and hence,
Upvote Value of universal gas constant (R) is same for all gases. What is its physical significance?
Value of universal gas constant (R) is same for all gases. What is its physical significance?
This is a short answer type question as classified in NCERT Exemplar
Unit of R depends on the units of p, V and T are measured, We know, R=
Upvote Two different gases ‘A’ and ‘B’ are filled in separate containers of equal capacity under the same conditions of temperature and pressure. On increasing the pressure slightly the gas ‘A’ liquefies but gas B does not liquify even on applying high pressure until it is cooled. Explain this phenomenon.
Two different gases ‘A’ and ‘B’ are filled in separate containers of equal capacity under the same conditions of temperature and pressure. On increasing the pressure slightly the gas ‘A’ liquefies but gas B does not liquify even on applying high pressure until it is cooled. Explain this phenomenon.
This is a short answer type question as classified in NCERT Exemplar
On increasing the pressure slightly the gas 'A' liquefies but gas B does not liquify even on applying high pressure until it is cooled at same conditions of temperature and pressure filled in equal capacity containers it
Upvote A gas that follows Boyle’s law, Charle’s law and Avogadro’s law is called an ideal gas. Under what conditions a real gas would behave ideally?
A gas that follows Boyle’s law, Charle’s law and Avogadro’s law is called an ideal gas. Under what conditions a real gas would behave ideally?
This is a short answer type question as classified in NCERT Exemplar
A gas that follows Boyle's law, Charle's law and Avogadro's law is called an ideal gas.
Real gas behaves ideal under low pressure and high temperature. Under these conditions, the intermolecular interactions are minimum.
Upvote What will be the molar volume of nitrogen and argon at 273.15 K and 1 atm?
What will be the molar volume of nitrogen and argon at 273.15 K and 1 atm?
This is a short answer type question as classified in NCERT Exemplar
The molar volume of both nitrogen and argon at 273.15 K and 1 atm is 22.4 L.
At STP (1 atm pressure and 273.15 K or 00 C), the molar volume i.e the volume of 1 mole gas is 22.4L.
Upvote Use the information and data given below to answer the questions (a) to (c):
• Stronger intermolecular forces result in higher boiling point.
• Strength of London forces increases with the number of electrons in the molecule.
• Boiling point of HF, HCl, HBr and HI are 293 K, 189 K, 206 K and 238 K respectively.
<!-- [if !supportLists]-->(a) <!--[endif]-->Which type of intermolecular forces are present in the molecules HF, HCl, HBr and HI?
<!-- [if !supportLists]-->(b) Looking at the trend of boiling points of HCl, HBr and HI, explain out of dipole-dipole interaction and London interaction, which one is predominant here
<!-- [if !supportLists]-->(c) Why is boiling point of hydrogen fluoride highest while that of hydrogen chloride lowest?
Use the information and data given below to answer the questions (a) to (c):
• Stronger intermolecular forces result in higher boiling point.
• Strength of London forces increases with the number of electrons in the molecule.
• Boiling point of HF, HCl, HBr and HI are 293 K, 189 K, 206 K and 238 K respectively.
<!-- [if !supportLists]-->(a) <!--[endif]-->Which type of intermolecular forces are present in the molecules HF, HCl, HBr and HI?
<!-- [if !supportLists]-->(b) Looking at the trend of boiling points of HCl, HBr and HI, explain out of dipole-dipole interaction and London interaction, which one is predominant here
<!-- [if !supportLists]-->(c) Why is boiling point of hydrogen fluoride highest while that of hydrogen chloride lowest?
This is a short answer type question as classified in NCERT Exemplar
(a) HCl, HBr and HI have dipole-dipole and london dispersion interaction whereas HF has hydrogen bonding in addition (due to the high electronegativity of the F atom).
(b) The electronegativity decreases from Cl,
Upvote The behaviour of matter in different states is governed by various physical laws. According to you what are the factors that determine the state of matter?
The behaviour of matter in different states is governed by various physical laws. According to you what are the factors that determine the state of matter?
This is a short answer type question as classified in NCERT Exemplar
The factors that determine the states of matter are:
1. Temperature
2. Pressure
3. Mass and volume
Upvote