State Of Matter & Phase Rule

20 Questions | By Rsayyed | Last updated: Mar 18, 2022 | Total Attempts: 92

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STATE OF MATTER & PHASE RULE

Questions and Answers

1.

Which of following describe the gaseous state of matter?
- A.
  
  A) A gas has both definite shape and volume.
- B.
  
  B) A gas has definite shape but not definite volume.
- C.
  
  C) A gas has definite volume but not definite shape.
- D.
  
  D) A gas has neither definite shape nor volume.
2.

One of the assumption s of the ideal gas law is that:
- A.
  
  A) Molecules have no attraction to one another.
- B.
  
  B) Gas particles move slowly.
- C.
  
  C) Molecules move in curved paths.
- D.
  
  D) None of the above.
3.

The phenomenon in which a substance exists in more than one crystalline form is known as:
- A.
  
  A) Polymorphism.
- B.
  
  B) Crystallinity.
- C.
  
  C) Anisotropy.
- D.
  
  D) Polycrystallinity.
4.

A vapor is:
- A.
  
  A) A very dense gas.
- B.
  
  B) A gas with weak vander waal forces.
- C.
  
  C) A gas that is normally a liquid.
- D.
  
  D) All of the above.
5.

Polymorphism refers to compound having:
- A.
  
  A) Different stereochemistry
- B.
  
  B) Different crystal structure
- C.
  
  C) Different composition
- D.
  
  D) All of the above.
6.

The max temp at which the two phase region exists in a mixture of two partially miscible liquid is known as:
- A.
  
  A) Upper con-solute temp.
- B.
  
  B) Lower con solute temp
- C.
  
  C) Critical temp.
- D.
  
  D) Kraft point.
7.

Amorphous form of a drug dissolves_______ than the crystalline form.
- A.
  
  A) Slower.
- B.
  
  B) Faster.
- C.
  
  C) Equal to.
- D.
  
  D) Does not dissolve.
8.

Which of the following are properties or examples of amorphous solids?
- A.
  
  A) No crystal structure
- B.
  
  B) No definite melting point
- C.
  
  C) Glassy
- D.
  
  D) All of the above.
9.

Mesomorphic substances:
- A.
  
  A) Are in between solid and liquid
- B.
  
  B) Are nematic
- C.
  
  C) Are smectic
- D.
  
  D) All of the above.
10.

What kind of liquid crystal consists of parallel molecules in layers?
- A.
  
  A) Cholesteric.
- B.
  
  B) Nematic.
- C.
  
  C) Smectic
- D.
  
  D) All of the above.
11.

The change of state from a solid directly to a gas is known as:
- A.
  
  A) Fusion
- B.
  
  B) Boiling
- C.
  
  C) Sublimation
- D.
  
  D) Evaporation
12.

Which of the following characteristics are NOT shared by liquid and gases?
- A.
  
  A) Ability to diffuse.
- B.
  
  B) Indefinite volume.
- C.
  
  C) Indefinite shape.
- D.
  
  D) Fluidity.
13.

The process of converting ice to water by application of heat proceed with:
- A.
  
  A) An increase in energy and a decrease in entropy.
- B.
  
  B) An increase in energy and an increase in entropy.
- C.
  
  C) A decrease in energy and a decrease in entropy.
- D.
  
  D) A decrease in energy and an increase in entropy.
14.

The phase rule was first discovered by
- A.
  
  A) Nernst
- B.
  
  B) Gibbs
- C.
  
  C) Arrhenius
- D.
  
  D) Le Chatelier
15.

A mixture of three gases O2, N2, CO2 is
- A.
  
  A) 1-phase system
- B.
  
  B) 2- phase system
- C.
  
  C) 3-phase system
- D.
  
  D) 4-phase system
16.

A saturated solution of sodium chloride is a
- A.
  
  A) One phase system
- B.
  
  B) Two phase system
- C.
  
  C) Three phase system
- D.
  
  D) none of the above
17.

At a triple point
- A.
  
  A) Both the temp & pressure are fixed
- B.
  
  B) Only temp is fixed
- C.
  
  C) Only the pressure is fixed
- D.
  
  D) Sometimes pressure & sometimes temp is fixed.
18.

A system with zero degree of freedom is known as
- A.
  
  A) Monovariant
- B.
  
  B) Bivariant
- C.
  
  C) Invariant
- D.
  
  D) None of the above.
19.

The number of components in a solution of common salt is
- A.
  
  0
- B.
  
  1
- C.
  
  2
- D.
  
  4
20.

The temp at which a polymorphic substance changes from one form to another is called
- A.
  
  A) Equilibrium temp
- B.
  
  B) Triple point
- C.
  
  C) Boyle’s temp
- D.
  
  D) Transition temp