Q25 / 118 · NTA Abhyas (NEET) 2020 · Chemistry · States of Matter

Which change must result in an increase in the average kinetic energy of the molecules of a sample of N2(g) ?

  • A
    The pressure changes from 0.5 atmosphere to 1 atm
  • B
    The volume changes from 1 L to 2 L
  • Correct answer
    C
    The temperature changes from 20°C to 30° C
  • D
    The density changes from 2.0 g/L to 2.5 g/L

Solution

Average K.E. per mol =32RT∝T
So, a temperature increases causes the molecules to more faster and this results in a higher average kinetic energy.

Hence, the correct answer is option: 'C'.

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