Chemistry - States of Matter

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Question - 1

Internal energy of gas (ideal) depends only on

  • A pressure
  • B temperature
  • C volume
  • D temperature and pressure

Question - 2

The temperature to which a gas must be cooled before it can be liquefied by compression is called

  • A Boyle's temperature
  • B critical temperature
  • C liquefaction temperature
  • D inversion temperature

Question - 3

Consider the following statements

1. When evaporation takes place, cooling takes place.

2. Evaporation takes place at all temperatures, boiling takes place only at the boiling point.

3. Evaporation is a surface phenomenon.

Which of the above is/are true?

  • A Only 1
  • B 1 and 2
  • C 2 and 3
  • D 1,2 and 3

Question - 4

Assertion (A) Surface tension decreases on increasing temperature. Reason (R) Intermolecular attractive forces are comparatively smaller at higher temperatures.

  • A Both A and R are true and R is the correct explanation of A
  • B Both A and R are true, but R is not the correct explanation of A
  • C A is true, but R is false
  • D A is false, but R is true

Question - 5

Which of the gases will have the highest rate if diffusion?

  • A O2
  • B CO2
  • C NH3
  • D N2

Question - 6

Assertion (A) The value of van der Waals' constant 'a' for NH is larger than for N2 

Reason (R) Ammonia has a lower molecular weight than nitrogen.

  • A Both A and R are true and R is the correct explanation of A
  • B Both A and R are true, but R is not the correct explanation of A
  • C A is true, but R is false
  • D A is false, but R is true

Question - 7

Consider the following statements

1. Particles of matter are continuously moving

2. As the temperature rises, particles move faster

3.With increase in temperature the kinetic energy of particles also increases

Which of the statements given above are correct?

  • A 1 and 2
  • B 1 and 3
  • C 2 and 3
  • D 1,2 and 3

Question - 8

At very low temperature, oxygen O2,  freezes and forms a crystalline solid.

Which term best describe the solids?

  • A Covalent network
  • B Molecular crysals
  • C Metallic
  • D lonic

Question - 9

Assertion (A) Lead is alloyed with tin or antimony to be used in soldering.

Reason (R) The interfacial and the solid is reduced and the liquid flows over solid surface.

  • A Both A and R are true and R is the correct explanation of A
  • B Both A and R are true, but R is not the correct explanation of A
  • C A is true, but R is false
  • D A is false, but R is true

Question - 10

Dry ice is used for making cold-baths in laboratories by mixing with volatile organic solvents. Identify the form of dry ice the following.

  • A Gaseous carbon dioxide
  • B Liquid carbon dioxide
  • C Solid carbon dioxide
  • D Solid hydrogen oxide