Class IX

When we mix BaCl2(aq) with Na2SO4(aq), which of the following observations is correct?
  1. no reaction takes place
  2. colourless solution is obtained 
  3. white precipitate is formed
  4. green precipitate is formed 
Identify the correct symbol of gold:
  1. Go
  2. Ge
  3. Gd
  4. Au
The combining capacity of an element is called
  1. Valency
  2. Atomicity
  3. Atomic number
  4. Valence electrons
To weigh the chemicals faster, we can use ____________.
  1. Physical balance
  2. Chemical balance
  3. Digital balance
  4. Any of these
Final mass in the above reaction includes _________. 
  1. Mass of BaSO4 + Mass of NaCl
  2. Mass of water + mass of BaSO4 + mass of NaCl + mass of empty beaker / conical flask 
  3. Mass of water + mass of BaSO4 
  4. Mass of water + mass of NaCl 
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