chemistry class 9 matter surrounding us

CO2 can be easily liquified and even solidified because

• It has weak forces of attraction

• It has comparatively more force of attraction than other gases

• It has more intermolecular space

• It is present in atmosphere.

Which of the following has heighest kinetic energy?

• Particles of ice at 0 °C

• Particles of water at 0 °C

• Particles of water at 100 °C

• Particles of steam at 100 °C

Bose-Einstein Condensate have

• Very low kinetic energy

• Low kinetic energy

• High kinetic energy

• Highest kinetic energy.

Which of the following is most suitable for summer?

• cotton

• nylon

• polyester

• silk

Which of the following is incorrect about plasma?

• Fluorescent tube and neon sign bulbs consist of plasma.

• The gas gets ionised when electrical energy flows through it.

• It consists of super-energetic and super-excited particles.

• The plasma glows with colour which does not depend upon nature of gas.

The colour of vapours formed on sublimation of iodine solid is

• Purple (violet)

• Colourless

• yellow

• orange

Under which of the following conditions we can boil water at room temperature?

• At low pressure

• At high pressure

• At very high pressure

• At atmospheric pressure

Which of the following is not endothermic process?

• Fusion

• Vapourisation

• Temperature

• Insoluble heavy impurities

Which of the following does not affect rate of evaporation?

• Wind speed

• Surface Area

• Temperature

• Insoluble heavy impurities

Kinetic energy of molecules is directly proportional to

• Temperature

• Pressure

• Both (a) and (b)

• Atmospheric pressure