Quiz  /  Reversible and Irreversible Reaction Class 9 MCQ Questions With...

  • 1. 
    If a reversible reaction is exothermic in the forward direction, it will be ...

  • exothermic in the reverse direction
  • endothermic in the forward direction too
  • endothermic in the reverse direction
  • not involve energy in reverse direction

  • 2. 
    What is a closed system

  • It gives out energy
  • The reactants and the products do not escape from reaction mixture
  • It takes in energy
  • The reactants and the products escape from he reaction mixture to be kept in the system

  • 3. 
    An _______ change cannot be undone because the change is permanent and generally creates a new substance.

  • Reversible
  • Irreversible

  • 4. 
    Which of the following chemical reactions is reversible?

  • CH4 + O2 ⇌ CO2 + H2O
  • CuSO4.5H2O → CuSO4 + 5H2O
  • NH4Cl ⇌ NH3 + HCl
  • CaCO3 → CaO +CO2

  • 5. 
    Which of the following reactions is irreversible?

  • Thermal decomposition of ammonium chloride.
  • Heating hydrated copper sulfate.
  • Composition of ammonia gas from nitrogen and hydrogen gases.
  • Combustion of ethanol.

  • 6. 
    Heating aqueous Copper sulfate gives

  • Black powder
  • Orange juice
  • White powder
  • Blue powder

  • 7. 
    What is the symbol which is used in reversible reactions?

  • →
  • Δ
  • +
  • ⇌

  • 8. 
    Which of the following combination is correct?

  • reversible ⇌irreversible →
  • reversible ←irreversible →
  • reversible ⇌irreversible ←
  • irreversible ⇌reversible →

  • 9. 
    Which of the following reactions never goes completion in a closed container?

  • H2 + I2 ⇌ 2HI
  • C2H5OH + 3O2 → 2CO2 + 3H2O
  • NaOH + HCl → NaCl + H2O
  • CuSO4 + Zn → ZnSO4 + Cu

  • 10. 
    Which of the following changes is irreversible change?

  • Melting of ice cube
  • Heating hydrated CuSO4
  • Frying an egg
  • Thermal decomposing NH4Cl

  • 11. 
    What is a Reversible reaction

  • A reaction going forward and backward at same time
  • A reaction going forward and backward at different time
  • forward reaction
  • backward reaction

  • 12. 
    When amounts of reactants and products become constant in reversible reaction, what might happen to the reversible reaction?

  • Reversible reaction reaches equilibrium.
  • Reversible reaction fastens forward reaction.
  • Reversible reaction fastens reverse reaction.
  • Reversible reaction slows down forward reaction.

  • 13. 
    If a reversible reaction is exothermic in the forward direction, it will be ...

  • exothermic in the reverse direction
  • endothermic in the forward direction too
  • endothermic in the reverse direction
  • not involve energy in reverse direction

  • 14. 
    Why is a reaction described as irreversible?

  • The products cannot be turned directly back into the reactants.
  • You need to apply heat to make the reaction work.
  • The products can be turned back into the reactants.
  • The reactants cannot be turned into the products.
Report Question
warning
access_time
  Time