81. Is it true that, at constant pressure, the volume of a given mass of a gas is directly proportional to the absolute temperature?
(a) Boyles law
(b) Both of these
(c) Charles Law
(d) None of these
82. What is the temperature at which a liquid’s vapour pressure equals that of the atmosphere or another external pressure?
(a) Boiling point
(b) External pressure
(c) Freezing point
(d) Diffusion
83. What is the name of the temperature at which the liquid and solid states are in equilibrium?
(a) Boiling point
(b) External pressure
(c) Freezing point
(d) Diffusion
84. What is the term for an element existing in more than one crystalline form?
(a) Allotropy
(b) Boiling point
(b) Crystalline solids
(d) Diffusion
85. The spontaneous mixing of particles is called?
(a) Evaporation
(b) Diffusion
(c) Sublimation
(d) Boiling
86. Which of the following statement for the particles of solid is not correct?
(a) They move at great speed
(b) They are arranged in regular pattern
(c) There is very little space between the particles
(d) The force of attraction between the particles are strong
87. The vapour pressure of a liquid increases with the?
(a) Increase of pressure
(b) Increase of intermolecular
(c) Increase of temperature
(d) Increase of polarity of molecules
88. Which of the following doesn’t fit the definition of an amorphous solid?
(a) Rubber
(b) Glucose
(b) Glass
(d) Plastic
89. Ink spreads in water because of?
(a) Vapour pressure
(b) Diffusion
(b) Expansion
(d) Compressibility of water
90. A solution is a homogenous mixture of?
(a) One substance
(b) Two or more substances
(c) Two substances
(d) None of these
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