Class IX

 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 
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 
The chemicals are weighed by ____________. 
  1. Spring balance
  2. Digital balance
  3. Analytical balance
  4. None of these 
 Which of the following precipitation reactions can be used to verify Law of Conservation of Mass?
  1. AgNO3(aq) +NaCl(aq) ?→AgCl(s) +NaNO3(aq) 
  2. ( ) Pb NO3 2(aq) +2K (aq) ?→Pb 2(s) +2KNO3(aq) I I 
  3. 4(aq) 2 3(aq) 3(s) 2 2 4(aq) CuSO +Na CO ?→CuCO + Na SO 
  4. All of these 
Which of the following is not correctly matched ?
  1. Calcium - Ca
  2. Silver - Ag
  3. Gold - Au
  4. Copper - Co
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