A. Increases
B. Decreases
C. Remain constant
D. Unpredictable
Related Mcqs:
- 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 - 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 - 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 - In a chemical reaction as shown in the bellow figure, it is observed that the (i) Rate of formation of ‘P’ is doubled on doubling the concentration of ‘X’ (ii) Rate of formation of ‘P’ is quadrupled on doubling the concentration of ‘Y’ (iii) Doubling the concentration of ‘Z’ does not affect the rate of formation of ‘P’ What is the order of the above chemical reaction ?
A. Zeroth order
B. First order
C. Second order
D. Third order - 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 - The fractional volume change between no conversion and complete conversion, for the isothermal gas phase reaction, 2A → R, is___________________?
A. 0.5
B. -0.5
C. 1
D. 1.5 - The fractional volume change of the system for the isothermal gas phase reaction, A → 3B, between no conversion and complete conversion is___________________?
A. 0.5
B. 1
C. 2
D. 3 - With the same reaction time, initial concentration and feed rate, the reaction 2A → B is carried out separately in CSTR and P.F. reactor of equal volumes. The conversion will be__________________?
A. Higher in P.F. reactor
B. Higher in CSTR
C. Same in both the reactors
D. Data insufficient; can’t be predicted - A chemical reaction, A → 3B, is conducted in a constant pressure vessel. Starting with pure A, the volume of the reaction mixture increases 3 times in 6 minutes. The fractional conversion is ___________________?
A. 0.33
B. 0.5
C. 1
D. Data insufficient, can’t be predicted - 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 _______________?
A. Zero
B. One
C. Two
D. Three
