Free MCQs & Online Quiz Practice for Exams

Q: Regarding liquefaction of gases, the highest critical temperature at a fixed pressure is of: (ETEA 2019)

A) SO₃

B) NH₃

C) Cl₂

D) CO₂

Q: For a gas when volume and pressure are 1 dm³ and 2 atm respectively what will be its new volume if the pressure is increased to 6 atm at constant temperature? (ETEA 2019)

A) 1/2 dm³

B) 1/3 dm³

C) 1/4 dm³

D) 2/3 dm³

Q: Which of the following gases has the highest rate of diffusion at the same temperature and pressure? (ETEA 2019)

A) HC

B) CO₂

C) C₂H₂

D) C₂H₅

Q: Distillation under reduced pressure is used to purify liquids which: (ETEA 2007)

A) Are explosive

B) Are highly volatile

C) Decompose at their boiling point

D) Have high boiling point

Q: Dispersion (London) forces — these forces between the particles are present in: (ETEA 2008)

A) Gases only

B) Liquids only

C) Solids only

D) All of the above

Q: Evaporation occurs at: (ETEA 2008)

A) All temperatures

B) Low temperature

C) High temperature

D) Absolute temperature

Q: Cleaning action of soap is due to: (ETEA 2009)

A) Decrease in surface tension of water

B) Viscosity of water

C) High boiling point of water

D) Polarity of water

Q: What type of intermolecular attractive forces are present in CO₂? (ETEA 2009)

A) Hydrogen bonding

B) Dipole–dipole interaction

C) London forces

D) Covalent bonding

Q: In which of the following compounds is hydrogen bonding possible? (ETEA 2012)

A) PH₃

B) CH₄

C) NH₃

D) SiH₄

Q: Choose the compound in which hydrogen bonding is NOT possible? (ETEA 2012)

A) CH₄

B) CH₃OH

C) H₂O

D) CH₃CH₂OH

Q: Which is true about London forces? (ETEA 2012)

A) London forces are present in nonpolar molecules

B) London forces are present in polar molecules

C) London forces are caused by permanent dipoles

D) All of the above

Q: Vapour pressure of a liquid can be measured by the barometric method and manometric method. Which is true? (ETEA 2013)

A) Barometric method is more accurate than manometric

B) Manometric method is more accurate than barometric

C) Both are equally accurate and applicable

D) Both are in use but are not reliable

Q: Liquids (crystalline substance) are used to locate tumors in the body because: (ETEA 2013)

A) These parts are warmer than the surroundings

B) These parts are cooler than the surroundings

C) These parts are constantly increasing and decreasing with temperature

D) None of the above

Q: Choose the compound in which hydrogen bonding is not possible: (ETEA 2013)

A) H₂O

B) HCl

C) CH₂COOH

D) CH₃CH₂OH

Q: Hydrogen bonding does not exist in the molecule of: (ETEA 2013)

A) Hydrogen

B) Proteins

C) Carbohydrates

D) Ammonia

Q: London dispersion forces are stronger in: (ETEA 2015)

A) Br₂

B) F₂

C) Cl₂

D) I₂

Q: Atomic size of xenon is larger than neon. Considering London dispersion forces which is true? (ETEA 2015)

A) Neon molecules have weaker London forces

B) Xe molecules have weaker London forces

C) Both have almost same London forces

D) Xe has lower boiling point than Ne

Q: Earthen pots keep water cool in hot summer due to: (ETEA 2015)

A) Capillary action

B) Surface tension

C) Evaporation

D) Combined effect of A & B

Q: The heat of vaporization of liquids A, B and C are 60, 30 and 40 cal/mol respectively. The order of decreasing intermolecular forces is: (ETEA 2015)

A) A > B > C

B) C > B > A

C) A > C > B

D) B > C > A

Q: Compound with the greatest number of hydrogen bonds is: (ETEA 2018)

A) CH₄

B) H₂O

C) HF

D) H₂SO₄