A. k/2
B. ln k/2
C. ln 2/k
D. ln 0.5/k
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 - The following half life data are available for the irreversible liquid phase reaction A → products. The overall order of reaction is __________________?
A. 0.5
B. 1
C. 1.5
D. 2 - 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 - Half life period of decomposition of a liquid ‘A’ by irreversible first order reaction is 12 minutes. The time required for 75% conversion of ‘A’ is _____________ minutes?
A. 18
B. 24
C. 6
D. 12 - A liquid decomposes by irreversible first order kinetics and the half life period of this reaction is 8 minutes. The time required for 75% conversion of the liquid will be ____________________ minutes?
A. 4
B. 8
C. 12
D. 16 - For a vapour phase catalytic reaction (A + B → P) which follows the Ridel mechanism and the reaction step is rate controlling, the rate of reaction is given by (reaction rate is irreversible, product also absorbs) ?
A. -rA = (k . PA . PB)/(1 + KAPA + KPPP)
B. -rA = (k . PA
2 – k1PP)/(1 + KAPA + KPPP)
C. -rA = (k . PA . PB)/(1 + KAPB + KBPB . KPPP)
D. -rA = (k . PA . PB)/(1 + KAPA) - Half life period of a chemical reaction is proportional to CA0 -1, if the reaction is of _______________ order?
A. First
B. Zero
C. Second
D. Third - The rate controlling step for the heterogeneous irreversible catalytic reaction A(g) + B(g) → C(g) is the surface reaction of absorbed A with absorbed B to give adsorbed C. The rate expression for this reaction can then be written as (where, KA, KB and KC are the equilibrium constants and is the rate constant of the rate controlling step) ?
A. k KA pApB / (1 + KApA + KBpB)
B. k KAKB pApB / (1 + KApA + KBpB)
C. k KAKB pApB / (1 + KApA + KBpB + KCpC)
D. k KAKB pApB / (1 + KApA + KBpB + KCpC)2 - The conversion of a reactant, undergoing a first order reaction, at a time equal to three times the half life of the reaction is ?
A. 0.875
B. 0.5
C. 0.425
D. Data insufficient to calculate - 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
