The equilibrium constant can be used to

  • predict direction of chemical reaction
  • predict extent of chemical reaction
  • determine the equilibrium concentration of mixture
  • all of above

The law of mass action was proposed by

  • Newton
  • Le Chatellier
  • C.M Guldberg and P.Waage
  • Lewis

Which of the following reactions causes acid droplets to spew in all directions?

  • acid base reaction
  • combustion
  • vigorous reaction
  • decomposition

The process by which ammonia is produced by the reaction of nitrogen with hydrogen at 200 atm pressure and in the presence of a catalyst is called

  • contact process
  • recovery of ammonia
  • calcination
  • Haber process

If a change is imposed in concentration, temperature or pressure on a chemical system at equilibrium, the system responds in a way that the change is

  • not opposed
  • opposed
  • rapidly increased
  • slowly increased

Which of the following statements about catalysts is not true?

  • they speed up a chemical reaction
  • they reduce the time taken to reach equilibrium
  • they have effect on the position of equilibrium once it is reached
  • they have no effect on the position of equilibrium one it is reached

What is denoted by the subscript 'c' in Kc?

  • chemical equilibrium
  • chemical reaction
  • molar concentration at equilibrium
  • rate of chemical reaction

What percentage of ammonia is produced at equilibrium by the Haber process?

  • 20 percent
  • 33 percent
  • 100 percent
  • 99 percent

In Haber's process, the amount of ammonia yields is

  • 0.4
  • 0.9
  • 0.33
  • 0.22

The relationship by which the values that relate amounts of products to reactants at equilibrium can be determined is called

  • law of conservation of mass
  • law of chemical reactions
  • law of mass action
  • active mass

The term "active mass" shows the concentration of reactants and products in

  • mol.dm-3 for a dilute solution
  • mol.cm-3 for a dilute solution
  • mol.dm-3 for a concentrated solution
  • mol.cm-3 for a concentrated solution

The equilibrium constant can be used to determine the equilibrium concentration of equilibrium mixture knowing the

  • final concentration of products
  • final concentration of reactants
  • initial concentration of reactants
  • initial concentration of products

What is established when the rate of evaporation equals the rate of condensation?

  • equality
  • equilibrium
  • reversible reaction
  • irreversible reaction

The rate at which a substance reacts is directly proportional to its

  • product
  • active mass
  • reactant
  • catalysts

When diluting acid always add

  • water to acid
  • acid to water
  • acid to oxygen
  • hydrogen to acid

The state at which forward and reverse reactions occur at the same rate is

  • equilibrium
  • unstable equilibrium
  • not in equilibrium
  • neutral equilibrium

Which of the following is used as a catalyst in the contact process?

  • Zeolite
  • Ag
  • Pd
  • Pt

Which process is used for the large scale production of sulphuric acid?

  • contact process
  • Haber process
  • sulphuric acid process
  • none of above

The rate at which the reaction proceeds is directly related to

  • active masses of reactants
  • sum of active masses of reactants
  • product of active masses of reactants
  • ratio of active masses of reactants

Unit of the equilibrium constant for 2NO + O2 2NO2 is

  • no units
  • mol dm-3
  • dm3mol-1
  • dm3mol-2
0 h : 0 m : 1 s

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