Class IX

The inexpensive and commonly used variety of glass is called soda glass. It is called so because
  1. was used initially for making bottles of soda(carbonated drink)
  2. is made using soda(sodium carbonate)
  3. was initially used for storing sodium carbonate
  4. is made using soda lime
The maximum number of isomers for an alkene with molecular formula C4H8 is
  1. 5
  2. 4
  3. 2
  4. 3
The oil used in the froth floatation process is
  1. coconut oil
  2. olive oil
  3. kerosene oil
  4. pine oil
The inherited traits of an organism are controlled by
  1. RNA molecules
  2. nucleotides
  3. DNA molecules
  4. enzymes
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
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