Class IX

To weigh the chemicals faster, we can use ____________.
  1. Physical balance
  2. Chemical balance
  3. Digital balance
  4. Any of these
 Mass remains conserved during chemical reaction is a statement of _____________.
  1. Law of Constant Composition
  2. Law of Multiple Proportion 
  3. Law of Conservation of Mass
  4. Dalton’s Law 
Which is an acceptor molecule/ion ?
  1. H+
  2. N2
  3. O2
  4. CH4
The no. of electrons in the valence shell of noble gasses are :
  1. 8
  2. 2
  3. 2 or 8
  4. 4
Which of the following is not correctly matched ?
  1. Calcium - Ca
  2. Silver - Ag
  3. Gold - Au
  4. Copper - Co
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