Quiz  /  Law of Mass Action Class 10 MCQ Questions With Answers

  • 1. 
    In the reaction AB-----> A + B reactant AB has 12g and product B has 5g. How many grams should product A have?

  • 17g
  • 2g
  • 7g
  • None of the above

  • 2. 
    The number of atoms of N (nitrogen) in 3N2O5 is

  • 2
  • 5
  • 6
  • 15

  • 3. 
    The dissolving of ice tea powder in water is

  • not a chemical reaction
  • partly a chemical reaction
  • it has reactants and products
  • None of the above

  • 4. 
    C4H6 + 3O2 ---------> 4CO2 + 3H2O is a

  • Decomposicion reaction
  • Combustion reaction
  • Sintesis reaction
  • None of the above

  • 5. 
    If a reaction starts with a total 75g of reactants it should produce

  • a total of 40g of products
  • a total of 75g of products
  • a total of 180 g of products
  • None of the above

  • 6. 
    2C2H2 + 5O2 -------> 4CO2 + 2H2O is a

  • Synthesis reaction
  • Decomposition reaction
  • Combustion reaction
  • None of the above

  • 7. 
    Oxygen must be present for what kind of reaction to occur?

  • Synthesis
  • Decomposition
  • Combustion
  • None of the above

  • 8. 
    In a reaction A + B ----> AB, reactant A has 4g and product AB has 10g. How many grams does reactant B should have?

  • 4g
  • 5g
  • 6g
  • 14g

  • 9. 
    C6H14 + O2 ------> CO2 + H2O is a

  • Synthesis Reaction
  • Decomposition Reaction
  • Combustion Reaction
  • None of the above

  • 10. 
    A decomposition reaction has

  • only one reactant
  • 2 reactants
  • many reactants
  • none of the above

  • 11. 
    Which of these is a chemical reaction?

  • Boiling water
  • Melting aluminum
  • Crushing a piece of chalk
  • Cooking an egg

  • 12. 
    If a reaction produces 18 grams, and one of its reactants had 10 grams, how much did the other reactant had?

  • 28 grams
  • 18 grams
  • 10 grams
  • 8 grams

  • 13. 
    2Li + O2 ------> Li2O is a

  • Synthesis reaction
  • Decomposition reaction
  • Combustion reaction
  • None of the above

  • 14. 
    2NH4OH----------> 4H2O + NO2 is a

  • Synthesis reaction
  • Decompostion reaction
  • Combustion reaction
  • None of the above

  • 15. 
    In a synthesis reaction one reactant has a masss of 6g and the second reactant has 12g. How much mass should the product of this reaction have?

  • 18g
  • 12g
  • 6g
  • None of the above

  • 16. 
    CO2 ---------> C + O2 is a

  • Synthesis reaction
  • Decomposicion reaction
  • Combustion
  • None of the above

  • 17. 
    2KClO3 ---------> 2KCl + 3O2 is a

  • Synthesis reaction
  • Decomposition reaction
  • Combustion reaction
  • None of the above

  • 18. 
    Na + Cl ------------> NaCl is a

  • Sintesis reaction
  • Decomposicion reaction
  • Combustion reaction
  • None of the above
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