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The molar heat capacity of oxygen gas at...

The molar heat capacity of oxygen gas at `STP` is nearly `2.5 R`. As the temperature is increased, it gradually increase and approaches `3.5 R`. The most appropriate reason for this behaviour is that at high temperatures

A

oxygen does not behave as an ideal gas

B

oxygen molecules dissociate in atoms

C

the molecules collide more frequently

D

molecular vibrations gradually become effective.

Text Solution

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The correct Answer is:
a
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Knowledge Check

  • The molar heat capacity at constant pressure of nitrogen gas at STP is nearly 3.5 R . Now when the temperature is increased, it gradually increases and approaches 4.5 R . The most approprite reason for this behaviour is that at high temperatures

    A
    nitrogen does not behave as an ideal gas
    B
    nitrogen molecules dissociate in atoms
    C
    the molecules collides more frequently
    D
    molecules vibration gradually beome effective

  • On increasing temperature of the reacting system by 10 degrees the rate of reaction almost doubles , The most appropriate reasons for this this is

    A
    Collision frequency increases
    B
    activation energy decreases by increases in termperature
    C
    The fraction of molecules having energy equal to threshold enregy or more increase
    D
    the value of threshold energy decreases

  • The molar heat capacity, C_(v) of helium gas is 3//2 R and is independent of temperature. For hydrogen gas, C_(v) approaches 3//2 R at a very low temperature, equals 5//2 R at moderate temperature and is higher than 5//2 R at high temperature. Choose the correct reason for the temperature dependence of C_(v) in case of hydrogen :

    A
    Hydrogen is diatomic so at high temperature rotational and vibrational motion also counts
    B
    Hydrogen is monoatomic so at high temperature rotational and vibrational motion also counts
    C
    Hydrogen is diatomic so at high temperature rotational and vibrational motion are not counted
    D
    can’t be defined

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