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States of Matter · Question 28

AIPMT 2002MCQEasy📈 Topic in 0% papers+4−1
1

Van der Waals real gas acts as an ideal gas at which conditions?

  1. High temperature, low pressure
  2. Low temperature, high pressure
  3. High temperature, high pressure
  4. Low temperature, low pressure

Answer

(1) High temperature, low pressure

Solution

van der Waals equation: (p + an2V2 )(V - nb) = nRT

A real gas behaves ideally when both corrections become negligible.

⇒ At low pressure the volume V is very large, so nb V (own volume of molecules negligible) and an2V2 is negligible (molecules far apart).

⇒ At high temperature the kinetic energy of molecules is large, so intermolecular attractions become negligible.

∴ As per NCERT, real gases show ideal behaviour at low pressure and high temperature (Z 1).

Answer: (1)

Out of syllabusAIPMT 2002

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2

The beans are cooked earlier in pressure cooker because

  1. boiling point increases with increasing pressure
  2. boiling point decreases with increasing pressure
  3. extra pressure of pressure cooker softens the beans
  4. internal energy is not lost while cooking in pressure cooker
Out of syllabusAIPMT 2001
3

Which of the following expressions correctly represents the relationship between the average molar kinetic energy, KE, of CO and N2 molecules at the same temperature?

  1. KECO = KEN2
  2. KECO > KEN2
  3. KECO < KEN2
  4. cannot be predicted unless volumes of the gases are given
Out of syllabusAIPMT 2000

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