Q48 / 118 · NTA Abhyas (NEET) 2020 · Chemistry · States of Matter

The ratio a/b (the terms used in van der Waal's equation) has the unit

  • A
    atm litre mol-1
  • B
    atm dm3mol-1
  • C
    dyne cm mol-1
  • Correct answer
    D
    All of these

Solution

P+ a n 2 v 2 v−nb =nRT
The units of 'a' = atm litre2mol-2
=atm dm6 mol-2=dyne cm2mol-2
And the untis of 'b' = litre mol-1 = m3mol-1 =cm3mol-1
Hence, unit of a/b = atm litre2mol-1 / litre mol-1=atm litre mol-1
Similarly all other units are possible.

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

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