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States of Matter · Question 27

AIPMT 2005MCQEasy📈 Topic in 0% papers+4−1
1

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

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

Answer

(3) H2O

Solution

As per NCERT, the magnitude of surface tension depends on the strength of the attractive forces between the molecules of the liquid.

∵ Each H2O molecule forms up to four hydrogen bonds (two O–H and two lone pairs), giving the strongest intermolecular forces; alcohols form fewer hydrogen bonds and benzene has only London forces.

⇒ Surface tension (approx., in mN m-1 at 20 °C): H2O 72.8 > C6H6 28.9 > CH3OH 22.6 ≈ C2H5OH 22.3

∴ Water has the maximum surface tension.

Answer: (3)

AIPMT 2005

Keep practising — States of Matter

2

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
3

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
4

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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