Which of the following does not affect rate of evaporation? (a) Wind speed(b) Surface area (c) Temperature(d) Insoluble heavy impurities

Which one of the following sets of phenomena would increase on raising the temperature? (a) Diffusion, evaporation, compression of gasesNCERT Books (b) Evaporation, compression of gases, solubility (c) Evaporation, diffusion, expansion of g

Which of the following is not a pure substance? a) Water b) Air c) Diamond d) Gold

Which of the following substances does not exist in a pure state in nature? a) Gold b) Oxygen c) Salt d) Air

The temperature at which a substance changes from a liquid to a gas is called: a) Boiling point b) Melting point c) Freezing point d) Condensation point

The process of changing a substance from a solid to a liquid state is called: a) Melting b) Freezing c) Evaporation d) Condensation

Which of the following is a compound? a) Air b) Carbon c) Saltwater d) Soil

Which of the following mixtures is stable and does not separate on standing? a) True Solution b) Colloidal Solution c) Suspension d) None of the above

Which of the following is an example of a pure substance? a) Sea water b) Sand c) Oxygen gas d) Colored candy

Milk of Magnesia is an example of: a) True Solution b) Colloidal Solution c) Suspension d) None of the above

The property to flow is unique to fluids. Which one of the following statements is correct? (a) Only gases behave like fluids. (b) Gases and solids behave like fluids. (c) Gases and liquids behave like fluids. (d) Only liquids are fluids.

Which of the following has heighest kinetic energy? (a) Particles of ice at 0 °C(b) Particles of water at 0 °C (c) Particles of water at 100 °C(d) Particles of steam at 100 °C