Class VII

Long chains of atoms are linked by
  1. hydrogen
  2. oxygen
  3. nitrogen
  4. carbon
Gases are
  1. incompressible
  2. compressible
  3. colorful
  4. denser than liquids and solids
Which of the following is a chemical change?
  1. Boiling of Water
  2. Tearing of Newspaper
  3. Cooking a vegetable
  4. Freezing water into ice
Regular arrangement of particles is found in
  1. solids and liquids
  2. liquids only
  3. solids only
  4. gases only
Which of the following MIGHT NOT tell a chemical change has taken place?
  1. Evolution of gas.
  2. Light is generated
  3. Production of heat
  4. Converting liquid into gas.
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