Class IX

The material which can be deformed permanently by heat and pressure is called a
  1. thermoplastic
  2. thermoset
  3. chemical compound
  4. polymer
The method that cannot be used for removing permanent hardness of water is
  1. adding sodium carbonate
  2. distillation
  3. adding caustic soda
  4. boiling
The most malleable metal is
  1. platinum
  2. silver
  3. iron
  4. gold
The gas used in the manufacture of vanaspati from vegetable oil is
  1. hydrogen
  2. oxygen
  3. nitrogen
  4. carbon dioxide
What are the number of moles of CO2 which contains 16 g of oxygen?
  1. 0.5 mole
  2. 0.2 mole
  3. 0.4 mole
  4. 0.25 mole
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