Class VII

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
When carbon dioxide gas is passed through lime water, it turns lime water into ________
  1. milky
  2. blue
  3. silver
  4. golden
Two indefinite characteristics of gases are
  1. volume and surface area
  2. volume and mass
  3. surface area and mass
  4. volume and shape
Melting point of ice is
  1. 0°C
  2. 1°C
  3. 100°C
  4. 50°C
Ammonia fertilizers are made by two components, those are
  1. Ammonia and Hydrogen
  2. Ammonia and Nitric Acid
  3. Nitrogen and Hydrogen
  4. Nitrogen and Water
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