Class VII

Chalk, limestone, marble, eggshells and seashells are made from
  1. calcium hydroxide
  2. calcium oxide
  3. calcium carbonate
  4. calcium chloride
Zinc salt react with dilute shulphuric acid to form zinc salt and
  1. hydrogen
  2. oxygen
  3. carbon monoxide
  4. carbon dioxide
Power machines in factories and vehicles for transports are examples of
  1. combustion
  2. thermal decomposition
  3. evaporation
  4. combination
A fuel formed from a fossil is known as
  1. decayed animal
  2. decayed plants
  3. fossil fuels
  4. crude oil
Natural gas is made up of compound
  1. carbon
  2. methane
  3. ethene
  4. ethane
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