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Try yourself:The no. of normal modes of vibration of naphthalene is

[2017]

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Try yourself:From the kinetic theory of gases, the ratio of most probable speed (C_{mp}) to root mean square speed (C_{rms}) is

[2016]

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Try yourself:The relationship between van der Waals 'b' co-efficient of N_{2} and O_{2} is

1. b(N_{2}) = b(O_{2}) = 0 ;

2. b(N_{2}) = b(O_{2}) ≠ 0 ;

3. b(N_{2}) > b(O_{2}) ;

4. b(N_{2}) < b(O_{2})

[2016]

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Try yourself:According to the equipartition principle, the predicted high temperature limiting value of the molar heat capacity at constant volume for C_{2}H_{2} is

[2015]

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Try yourself:Among (l)Ar, (2)NH_{4}CI, (3)HF and (4)HCl ,the strength of interatomic/intermolecular forces follows the order:

[2014]

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Try yourself:According to the equipartition principle of energy, the molar heat capacity at constant volume for CO_{2}(g), SO_{2}(g) and H_{2}O (g) follows the trend :

1. CO_{2} = SO_{2} = H_{2}O ;

2. CO_{2} > SO_{2} = H_{2}O ;

3. H_{2}P > SP_{2 }= CP_{2 };

4. CO_{2 }= SO_{2} > H_{2}O

[2014]

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Try yourself:The average speed of H_{2}, N_{2} and O_{2} gas molecules is in the order

1. H_{2} > N_{2} > O_{2} ;

2. O_{2} > N_{2} > H_{2 };

3. H_{2} > O_{2 }> N_{2} ;

4. N_{2} > O_{2 }> H_{2}.

[2012]

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Try yourself:Based on the principle of equipartition of energy, the molar heat capacity of CO_{2} at constant volume C_{v,m} is

[2011]

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Try yourself:The molar internal energy of a gas at temperature T is U_{m}(T). The molar internal energy at T = 0 is U_{m}(0). The correct expression that relates these two with appropriate contributions is

1. U_{m}(T) = U_{m}(0) + 3RT | Linear molecule ; translation only]

2. U_{m}(T) = U_{m}(0) + 5/2RT | Linear molecule ; translation and rotation only|

3. U_{m}(T) = U_{m}(0) + 3/2RT | Non-linear molecule ; translation and rotation only|

4. U_{m}(T) = U_{m}(0) + RT | Non-linear molecule ; translation only|.

[2010]

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Try yourself:Consider two identical containers, one with 1 mole of H_{2} and the other with 1 mole of He. If the root-mean-square ( RMS ) velocities of two gases are the same , then the ratio of the temperature T(H_{2})/T(He) is

[2009]

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Try yourself:For an ideal gas, the plot that is NONLINEAR is

1. PV vs. T ;

2. PV vs. P, at constant T ;

3. P vs. V, at constant T ;

4. In P vs. In V, at constant T.

[2009]

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Try yourself:Given that the most probable speed of oxygen gas is 1000 ms^{-1}, the average speed under the same conditions is

[2008]

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Try yourself:The Maxwell-Boitzmann distribution for molecule speeds is shown in the following figure.

In the figure, H is the height of the peak, L is the location of the maximum and W is the width at half height. As the temperature is decreased

1. H increases, L decreases and W increases ;

2. M Increases, L decreases and W decreases ;

3. H decreases, L Increases and W increases ;

4. H decreases, L decreases and W decreases.

[2006]

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Try yourself:The molar heat capacity at constant volume of a colourless gas is found to be 25 J/mol/K. at room temperature. The gas must be

[2006]

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Try yourself:For the distribution of molecular velocities of gases, identify the correct order from the following (where v_{mp}, , v_{av} and v_{rms} are the most probable velocity , average velocity and root mean square velocity respectively):

[2005]

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