The constant 'a' in Van der Waal's equation is maximum for:
Correct answer: D. Ammonia
- A. Helium
- B. Hydrogen
- C. Oxygen
- D. Ammonia
Explanation
'a' is coefficient of attraction or attraction per unit volume.Since ammonia has hydrogen bonding (strong intermolecular forces of attraction). It has maximum value of 'a'.
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About Real and Ideal Gases
An ideal gas is modelled as particles with negligible volume and no intermolecular attraction, obeying Boyle's, Charles's and Avogadro's laws through PV = nRT. Real gases deviate from this behaviour, especially at high pressure and low temperature, because particle volume and attractive forces matter; the van der Waals equation explains these corrections.
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