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States of Matter · Question 25

AIPMT 2010 (Mains)MCQEasy📈 Topic in 38% papers+4−1
1

The pressure exerted by 6.0 g of methane gas in a 0.03 m3 vessel at 129 is (Atomic masses : C = 12.01, H = 1.01 and R = 8.314 J K-1 mol-1)

  1. 215216 Pa
  2. 13409 Pa
  3. 41648 Pa
  4. 31684 Pa

Answer

(3) 41648 Pa

Solution

Molar mass of CH4 = 12.01 + 4 × 1.01 = 16.05 g mol-1

n = 6.016.05 = 0.3738 mol

T = 129 + 273 = 402 K

pV = nRT

p = nRTV

= 0.3738 8.314 4020.03

= 41648 Pa

Answer: (3)

Out of syllabusAIPMT 2010 (Mains)

Keep practising — States of Matter

2

If a gas expands at constant temperature, it indicates that

  1. kinetic energy of molecules remains the same
  2. number of the molecules of gas increases
  3. kinetic energy of molecules decreases
  4. pressure of the gas increases
Out of syllabusAIPMT 2008
3

The surface tension of which of the following liquids is maximum ?

  1. C2H5OH
  2. CH3OH
  3. H2O
  4. C6H6
AIPMT 2005
4

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
Out of syllabusAIPMT 2002
5

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
6

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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