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Le-Chatelier's principle and It’s applications MCQ Advance level

Dear Readers,

Compared to other sections, Chemistry is considered to be the most scoring section. If prepared thoroughly, chemistry can help students to secure a meritorious position in the exam. These questions are very important in achieving your success in Exams after 12th.

Q1. In the formation of SO3 by contact process, the conditions used are

  •  Catalyst, optimum temperature and higher concentration of reactants
  •  Catalyst, optimum temperature and lower concentration of reactants
  •  Catalyst, high temperature and higher concentration of reactants
  •  Catalyst, lower temperature and lower concentration of reactants

Catalyst, optimum temperature and higher concentration of reactants

Q2. In a vessel containing SO3 , SO2 andO2 at equilibrium, some helium gas is introduced so that the total pressure increases while temperature and volume remain constant. According to Le - chatelier principle, the dissociation of SO3

  •  Increases
  •  Decreases
  •  Remains unaltered
  •  Changes unpredictably

Remains unaltered

Q3. The endothermic reaction (M + N ⇌ P) is allowed to attain an equilibrium at 20*C. Formation of P can be increased by

  •  Raising temperature
  •  Lowering temperature
  •  Keeping temperature constant
  •  Decreasing the concentration of M and N

Raising temperature

Q4. In N2 + 3H2 ⇌ 3NH3 reversible reaction, increase in pressure will favour

  •  Reaction in forward direction
  •  Reaction in reverse direction
  •  Will not exert any effect
  •  In backward and forward direction equally

Reaction in forward direction

Q5. The formation of NO2 in the reaction, 2NO + O2 ⇌ 2NO2 + heat is favoured by

  •  Low pressure
  •  High pressure,Low temperature
  •  Low temperature,low pressure
  •  Reduction in the mass of O2

High pressure,Low temperature

Q6.  If a mixture containing 3 moles of hydrogen and 1 mole of nitrogen is converted completely into ammonia, the ratio of initial and final volumes at the same temperature and pressure would be

  •  2 : 1
  •  1 : 2
  •  3 : 1
  •  1 : 3

2 : 1

Q7. In Haber process 30 litres of dihydrogen and 30 litres of dinitrogen were taken for reaction which yielded only 50% of the expected product. What will be the composition of gaseous mixture under the aforesaid condition in the end

  •  20 litres ammonia, 25 litres nitrogen, 15 litres hydrogen
  •  20 litres ammonia, 20 litres nitrogen, 20 litres hydrogen
  •  10 litres ammonia, 25 litres nitrogen, 15 litres hydrogen
  •  20 litres ammonia, 10 litres nitrogen, 30 litres hydrogen

10 litres ammonia, 25 litres nitrogen, 15 litres hydrogen

Q8.  Which of the following factors will favour the reverse reaction in a chemical equilibrium

  •  Increase in the concentration of one of the reactants
  •  Removal of at least one of the product at regular time intervals
  •  Increase in the concentration of one or more products
  •  None of these

Increase in the concentration of one or more products

Q9. In the reversible reaction of type A+B ⇌ AB, in general

  •  Neither of the reactions will be endothermic
  •  Both the reactions will be exothermic
  •  The combination reaction will be endothermic and the dissociation reaction will be exothermic
  •   The combination reaction will be exothermic and the dissociation reaction will be endothermic

The combination reaction will be exothermic and the dissociation reaction will be endothermic

Q10. On addition of an inert gas at constant volume to the reaction N2 + 3H2 ⇌ 2NH3 at equilibrium

  •  The reaction remains unaffected
  •  Forward reaction is favoured
  •  The reaction halts
  •  Backward reaction is favoured

The reaction remains unaffected



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