Class 11 Chemistry · Chapter 5 · Test 1
Gases, Liquids, Solids
This 42-question MCQ test covers Chapter 5. It has 8 complete exercise MCQs (Q.1 I, II, III, IV, V, VIII, X and XI) and 34 topic-based MCQs, 2 for each of 17 topics from 5.1 to 5.13. Each question is worth 1 mark, for a total of 42 marks.
42 questions · 35 min · 42 marks
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Sample questions
The first 5 of 42. Try each one, then tap to see the answer.
Question 1
London dispersion forces are the only forces present among:
- Amolecules of water in liquid state
- Batoms of helium in gaseous state at high temperature
- Cmolecules of solid iodine
- Dmolecules of hydrogen chloride gas
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Answer: C
Iodine is non-polar so only id-id (London dispersion) forces act among its molecules. Water has hydrogen bonds and HCl has pd-pd forces.
Question 2
When the vapour pressure of a liquid equals the external pressure what phenomenon occurs?
- ASublimation
- BCondensation
- CBoiling
- DFreezing
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Answer: C
A liquid starts boiling when its vapour pressure becomes equal to the atmospheric or external pressure.
Question 3
When water freezes at 0 oC its density decreases due to:
- Acubic structure of ice
- Bempty spaces present in the structure of ice
- Cdecrease in volume
- Ddecrease in viscosity
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Answer: B
Extensive hydrogen bonding in ice creates empty spaces so water occupies about 9% more space and its density decreases.
Question 4
Which of following is the correct sequence of increasing ΔHv values of substances mentioned?
- AH2O > NH3 > F2
- BF2 > NH3 > H2O
- CNH3 > H2O > F2
- DH2O > F2 > NH3
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Answer: A
The text gives ΔHv of water as 40.6 kJ/mol and NH3 as 21.7 kJ/mol because of stronger hydrogen bonding in water. F2 has only weak London forces so it is lowest.
Question 5
Surface tension of a liquid is due to:
- Ainward pull of surface molecules
- Bupward pull from the surface
- Ccollision of molecules
- Drepulsive forces
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Answer: A
Molecules at the free surface are pulled inward by the molecules below the surface and this tends to contract the surface.
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