If the time required to change the concentration of reactant to half its original value is independent of the initial concentration, the order of reaction is _______________?

Related Mcqs:

1. Rate constant for a first order reaction does not depend upon reaction time, extent of reaction and the initial concentration of reactants; but it is a function of reaction temperature. In a chemical reaction, the time required to reduce the concentration of reactant from 100 gm moles/litre to 50 gm moles/litre is same as that required to reduce it from 2 gm moles/litre to 1 gm mole/litre in the same volume. Then the order of this reaction is ?

   A. 0
   B. 1
   C. 2
   D. 3

2. In a chemical reaction, represented by as shown in the bellow figure, it is observed that the (i) Rate of reaction increases by a factor of 4 on doubling the concentration of the reactant. (ii) Rate of reaction increases by a factor of 9 on trebling the concentration of the reactant. Then the rate of the reaction is proportional to(where, CA = concentration of the reactant)_____________________?

   A. CA
   B. CA2
   C. CA3
   D. CA4

3. Second order consecutive irreversible reaction as shown in the bellow figure, were carried out in a constant volume isothermal batch reactor with different initial feed compositions. Reactor temperature was same in all the cases. In experiments where the ratio of concentration of B to that of A in the initial feed was less than 0.5, the concentration of B increased first, reached a maximum and then declined with time. However, for all experiments where this concentration ratio was 0.5 or above, concentration of B decreased monotonically with time right from the beginning. What is the ratio of the two rate constants (k1/k2) ?

   A. 1/4
   B. 1/2
   C. 2
   D. 4

4. Consider the ‘n’ th order irreversible liquid phase reaction A → B. Which one of the following plots involving half life of the reaction (t1/2) and the initial reactant concentration (CA0) gives a straight line plot ?

   A. CA0 Vs t1/2
   B. ln CA0 Vs t1/2
   C. CA0 Vs ln t1/2
   D. ln CA0 Vs ln t1/2

5. If n = overall order of a chemical reaction. a = initial concentration of reactant. t = time required to complete a definite fraction of the reaction. Then pick out the correct relationship ?

   A. t ∝ 1/an
   B. t ∝ 1/an – 1
   C. t ∝ 1/an + 1
   D. t ∝ an

6. Half-life period for a first order reaction is _____________ the initial concentration of the reactant?

   A. Directly proportional to
   B. Inversely proportional to
   C. Independent of
   D. None of these

7. Concentration of the limiting reactant (with initial concentration of a moles/litre) after time t is (a-x). Then ‘t’ for a first order reaction is given by____________________?

   A. k. t = ln a/(a – x)
   B. k. t = x/a (a – x)
   C. k. t = ln (a – x)/a
   D. k. t = ln a (a – x)/x

8. In a first order reaction, the time required to reduce the concentration of reactant from 1 mole/litre to 0.5 mole/litre will be ______________ that required to reduce it from 10 moles/litre to 5 moles/litre in the same volume ?

   A. More than
   B. Less than
   C. Same as
   D. Data insufficient; can’t be predicted

9. What is the order of a chemical reaction in which doubling the initial concentration of the reactants doubles the half life time of the reaction ?

   A. 0
   B. 1
   C. 2
   D. 3

10. The knowledge of initial concentration and rate constant is necessary to determine the half life time of a reaction of _______________ order?

    A. Zero
    B. First
    C. Second
    D. None of these