Matter in our Surroundings

Which one of the following is an example of a fluid?

• Oxygen

• Carbon

• Phosphorus

• Sulphur

235K = _________°C

• 38

• -20

• 20

• -38

Which of the following statements is NOT true?

• The molecules in a liquid and a gas can flow.

• The molecules in a liquid are arranged in a regular pattern.

• The molecules in a gas move about randomly at high speed.

• The molecules in a solid vibrate about a fixed position

Name the process by which dry ice changes into carbon dioxide gas.

• Evaporation

• Condensation

• Sublimation

• Vaporisation

At what temperature liquid water and steam co-exist?

• At the melting point of ice

• At the boiling point of water

• At the freezing point of water

• At the condensation point

Melting point of ice is

• 273.16K

• 373.15K

• 100°C

• 250.18K

Which of the following undergoes sublimation?

• Sodium chloride

• Potassium chloride

• Ammonium sulphate

• Ammonium chloride

In which of the following conditions, the distance between the molecules of hydrogen gas would decrease?

• Increasing the pressure on hydrogen in a closed container

• Increasing the volume of the container of hydrogen gas

• Heating the container

• Some hydrogen gas leaking out of container

Which one among the followings has a fixed volume but no fixed shape?

• Carbon dioxide

• Ice

• Kerosene

• Xenon

A few substances are arranged in the increasing order of ‘forces of attraction’ between their particles. Which one of the following is the correct arrangement?

• oxygen – honey – sugar

• oil – air– salt

• juice – salt – oxygen

• salt – air – sugar solution