Relating Translational KE and T

Q.

Which of the following has the highest kinetic energy?

1. particles of ice $0°\mathrm{C}$

2. particles of water at $0°\mathrm{C}$

3. particles of water at hundred degrees Celsius

4. particles of steam at a hundred degrees Celsius

Q. 5. Maximum number of molecules are present in: 1. 15 litre of water at stp 2. 15 litre of H2O gas at stp 3. 15 g of ice 4. Same in all

Q. The maximum number of molecules is present in(1) 15 L of water at STP(2) 15 L of H2O gas at STP(3) 15 g of ice(4) Same in all

Q.

For monoatomic gases, the total kinetic energy is equal to translational kinetic energy.

1. True

2. False

Q. 29. A diatomic gas of molecular mass 40 g/mol isfilled in a rigid container at temperature 30^° C. It ismoving with velocity 200 m/s. If it is suddenlystopped, the rise in the temperature of the gas is32320o(2) C332003.2(4) C

Q.

The area under the Maxwell distribution curve represents:

1. Total number of gas molecules

2. Maximum fraction of molecules

3. Minimum fraction of molecules

4. Distribution of speeds

Q. 31. a moles of pcl5 are heated in a closed container till equilibrium is established at a pressure of P atm. If b moles of pcl5 dissociate at equilibrium then what is the relation between a, b, kp, P

Q. Why real gases which are the actually existing gases obey gas equation only under 2 conditions Low pressure High temperature

Q. 15. In a container, equal masses of hydrogen gas, He and methane gas are mixed. Find the ratio of their partial pressure.

Q. The following data are obtained when dinitrogen and dioxygen react together to form different compounds :

	Mass of dinitrogen	Mass of dioxygen
(i)	14g	16g
(ii)	14g	32g
(iii)	28g	32g
(iv)	28g	80g

(a) Which law of chemical combination is obeyed by the above experimental data? Give its statement.

Q.

At the same temperature and pressure which of the following gas will have highest KE per mol?

1. 

2. 

3. 

4. 

Q. if b increases then which of the following is incorrect ? (a)effective size of molecule will increase (b)compressible volume will decrease (c) incompressible volume will increase (d)effective size of molecule will decrease

Q. During expansion of a gas at a fixed temperature ?

1. There occurs a decrease in pressure
2. There is no change in K.E. of the molecules of gas
3. There occurs a decrease in K.E. of the gaseous molecules
4. There occurs an increase in number of gas molecules

Q.

The molecular velocities of two gases at same temperature are $u_1$ and $u_2$, their molar masses are $m_1$ and $m_2$ respectively. Which of the following expression is correct?

1. $\frac{m_1}{u_1^2}=\frac{m_2}{u_2^2}$

2. $m_1{u}_1=m_2{u}_2$

3. $\frac{m_1}{u_1}=\frac{m_2}{u_2}$

4. $m_1{u}_1^2=m_2{u}_2^2$

Q. At a particular temperature, the vapour pressures of 'A' and 'B' are $250mmHg$ and $180mmHg$ respectively. If the mole fraction of 'B' in the solution mixture is 0.42, the total vapour pressure of the solution mixture is $200mmHg$.
Choose the correct statement.

1. The solution mixture is ideal
2. The solution mixture obeys Raoult's law
3. The solution mixture shows negative deviation from Raoult's law
4. The solution mixture shows positive deviation from Raoult's law

Q. In a thermodynamic process two moles of a monatomic ideal gas obeys P o V-2. If temperature of the gas increases from 300 K to 400 K, then find work done by the gas (where R universal gas constant) (2) -200 R (4) -400 R (1) 200 R (3)-100 R

Q.

at what temperature rms velocity of SO2 will be same as that of methane gas at 300K?

Q.

Molecular velocities of the two gases at the same temperature are $u_1$ and $u_2$. Their masses are $m_1$ and $m_2$ respectively. Which of the following expressions is correct

1. 

2. 

3. 

4. 

Q. arrange O2 , CO2 , H2, He in inc order of vanderwall constant a & b?

Q. Which of the following statements is/are wrong ?

1. At a given temperature the transitional K.E. of one mole of every gas is same which is equal to $\frac{3}{2}RT$
2. K.E. of a gas depends on its mass
3. K.E. depends on the volume
4. K.E. depends on the pressure

Q.

Two perfect gases at absolute temperatures $T_1$ and $T_2$ are mixed. Assuming that there is no loss of energy. Find the temperature T of the mixture if the masses of the molecules are $m_1$ and $m_1$ and the number of molecules in the gases are $n_1$ and $n_2$.

1. $T_1{T}_2$

2. $\frac{T_1}{T_2}$

3. $\frac{n_1{T}_1+n_2{T}_2}{n_1+n_2}$

4. $\frac{n_1{T}_1+n_2{T}_2}{T_1+T_2}$

Q. At a particular temperature, the vapour pressures of 'A' and 'B' are $250mmHg$ and $180mmHg$ respectively. If the mole fraction of 'B' in the solution mixture is 0.42, the total vapour pressure of the solution mixture is $200mmHg$.
Choose the correct statement.

1. The solution mixture shows negative deviation from Raoult's law
2. The solution mixture is ideal
3. The solution mixture shows positive deviation from Raoult's law
4. The solution mixture obeys Raoult's law

Q. The volume of oxygen liberated from 0.68 gm of $H_2{O}_2$ is

1. 336 ml
2. 224 ml
3. 56 ml
4. 112 ml

Q. 18. For the reaction $\frac{1}{8}{\mathrm{S}}_{8\left(\mathrm{s}\right)}+\frac{3}{2}{{\mathrm{O}}_2}_{\left(\mathrm{g}\right)}\to {\mathrm{SO}}_{3\left(\mathrm{g}\right)}$, the difference of heat change at constant pressure and constant volume at 27°C will be
(1) +150 R (2) – 150 R (3) + 450 R (4) – 450 R

Q.

At the same temperature and pressure which of the following gas will have highest KE per mol?

1. $H_2$

2. $O_2$

3. $C{H}_4$

4. $Equal$

Q. Two flask $A$ and $B$ of equal volumes maintained at temperature $300K$ and $700K$ contains equal mass of $He\left(g\right)$ and $N_2\left(g\right)$ respectively. What is the ratio of translational kinetic energy of gas in flask $A$ to that of flask $B$ ?

1. $1:3$
2. $3:1$
3. $3:49$
4. None of these