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Twelfth Grade (Grade 12) Kinetics and Equilibrium Questions

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Grade 12 Kinetics and Equilibrium
In a reversible chemical reaction, which of the following parameters remains unchanged even with the addition of a catalyst?
  1. Equilibrium constant
  2. Rate of reaction
  3. Percentage yield of reaction
  4. Concentration of reactants
Grade 12 Kinetics and Equilibrium
The equilibrium, [math]H_2O (l) harr H^+(aq) + OH^[-] (aq)[/math], is
  1. dynamic.
  2. static.
  3. physical.
  4. mechanical.
Grade 12 Kinetics and Equilibrium
Which statement correctly describes a saturated solution?
  1. The solvent can dissolve more solute if it is added.
  2. The solvent cannot contain undissolved solute.
  3. The dissolved form of the solute is at equilibrium with the undissolved solute.
  4. The dissolved solute is not at equilibrium with the undissolved solute.
Grade 12 Kinetics and Equilibrium
Consider the following chemical reaction:

[math]2KClO_3(s) + heat rarr2KCl(s) + 3O_2(g)[/math]

Which catalyst should be used to increase the rate of this reaction?
  1. [math]MnO_2[/math]
  2. [math]V_2O_5[/math]
  3. [math]Al_2O_3[/math]
  4. [math]ZnO[/math]
Grade 12 Kinetics and Equilibrium
Which of the following chemical reactions is an example of a first-order reaction?
  1. [math]N_2O_5(g) rarr N_2O_4 (g) + (1/2) O_2(g)[/math]
  2. [math]CH_3CHO (g) rarr CH_4(g) + CO(g)[/math]
  3. [math]2HI (g) rarr H_2(g) + I_2(g)[/math]
  4. [math]2NO + Cl_2 rarr2NOCl[/math]
Grade 12 Kinetics and Equilibrium
Consider the following chemical reaction:

[math]2CH_3CHO (g) -> CH_4(g) + CO(g)[/math]

What is the correct expression for the rate law of this chemical reaction?
  1. [math]Rate=k[CH_3CHO]^2[/math]
  2. [math]Rate=k[CH_3CHO][/math]
  3. [math]Rate=k[CH_4] [CO][/math]
  4. [math]Rate=k[CO][/math]
Grade 12 Kinetics and Equilibrium
The rate constant depends upon which of the following?
  1. Temperature
  2. Time
  3. Initial Concentration
  4. None of these
Grade 12 Kinetics and Equilibrium
Which of the following reactions is an example of homogeneous catalysis?
  1. Alkylation of benzene using hydrochloric acid as the catalyst
  2. Hydrogenation of alkenes using finely divided Ni as the catalyst
  3. Conversion of [math]SO_2 to SO_3[/math] using solid vanadium pentoxide as the catalyst
  4. In Haber's process for the synthesis of ammonia, iron is used as the catalyst along with [math]K_2O and Al_2O_3[/math]
Grade 12 Kinetics and Equilibrium
What is a simpler way of describing an elementary step?
  1. Two or more collisions
  2. The rate-determining step
  3. The most effective collision
  4. One collision or vibration
Grade 12 Kinetics and Equilibrium
For the first order reaction with rate constant k, which expression will give the half-life period with respect to its initial concentration a?
  1. [math][1//ka][/math]
  2. [math][1_n2//k][/math]
  3. [math]0.693//ka[/math]
  4. [math]k = 1_n a//t[/math]
Grade 12 Kinetics and Equilibrium
What do you call a catalyst that exists in the same phase as that of reactant?
  1. Homogeneous
  2. Heterogeneous
  3. Inhibitor
  4. Promoter
Grade 12 Kinetics and Equilibrium
The rate of reaction depends on the surface area of a catalyst in
  1. homogeneous catalysis.
  2. enzyme catalysis.
  3. acid catalysis.
  4. heterogeneous catalysis.
Grade 12 Kinetics and Equilibrium
In the reaction, [math]2A + B rarr A_2B[/math][math][/math], if the concentration A is doubled and that of B is halved, then the rate of reaction will
  1. increase by 4 times.
  2. decreases by 2 times.
  3. remain the same.
  4. increase by 2 times.
Grade 12 Kinetics and Equilibrium
In the following chemical reaction:

[math]2H_2O_2 rarr 2H_2O + O_2[/math],

glycerol is used as a(n)
  1. inhibitor
  2. promoter
  3. enzyme
  4. poison
Grade 12 Kinetics and Equilibrium
Which of the following factors does not decide the order of reaction?
  1. pH of solution
  2. Nature of solvent
  3. Concentration of reactants
  4. Volume of products
Grade 12 Kinetics and Equilibrium
The decomposition of ammonia on the surface of tungsten is a reaction of which order?
  1. Zero
  2. First
  3. Second
  4. Third
Grade 12 Kinetics and Equilibrium
The molecularity and the order of reactions
  1. are always same.
  2. are always different.
  3. may be same.
  4. none of these
Grade 12 Kinetics and Equilibrium
Consider the equilibrium reaction of acid indicator HIn:

HIn [math]harr[/math] [math]H^(+)[/math] + [math]In^(-)[/math]

[math]K_(In)[/math] = Ionization constant of the indicator

Which of the following represents a correctly written expression to calculate the concentration of hydrogen ions?
  1. [math][H^(+)] = K_(In) [/math] [Acid form]
  2. [math][H^(+)] = K_(In) [/math] [Acid form]/[Basic form]
  3. [math][H^(+)] = K_(In) [/math] [Basic form]/[Acid form]
  4. [math][H^(+)] = K_(In) [/math] [Basic form]
Grade 12 Kinetics and Equilibrium
Which of the following rate laws is correct for a unimolecular reaction?
  1. Rate=k[A]
  2. Rate=k[A][B]
  3. Rate=k[A][B][C]
  4. None of the above
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