States of Matter: Gases and liquids Test

Result

States of Matter: Gases and liquids Test - 8

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Weekly Quiz Competition

Question 1
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'a' and 'b' are the Van der Waals constants for two gases ammonia and ethane. Ammonia is more easily liquefied than ethane because of

A
'a' for NH₃< 'a' for C₂H₆ but 'b' for NH₃ > 'b' for C₂H₆

B
'a' and 'b' for NH₃ < 'a' and 'b' for C₂H₆

C
'a' and 'b' for NH₃ > 'a' and 'b' for C₂H₆

D
'a' for NH₃ > 'a' for C₂H₆and 'b' for NH₃ < 'b' for C₂H₆

Solution

Van der Waals constant 'a' measures the inter-molecular forces of attractions and 'b' measures the size of gaseous molecule.
'a' is greater for ammonia because of H-binding between the molecules.
'b' (effective volume) for the molecules is greater for ethane.