The half life period of a first order reaction is given by (where, K = rate constant) ?
A. 1.5 K
B. 2.5 K
C. 0.693/K
D. 6.93 K
Chemical Reaction
The reason why a catalyst increases the rate of reaction is that, it______________?
The reason why a catalyst increases the rate of reaction is that, it______________?
A. Decreases the energy barrier for reaction
B. Increases the activation energy
C. Decreases the molecular collision diameter
D. None of these
A catalyst______________________?
A catalyst______________________?
A. Initiates a reaction
B. Lowers the activation energy of reacting molecules
C. Is capable of reacting with any one of the reactants
D. Cannot be recovered chemically unchanged at the end of a chemical reaction
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) ?
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
Reaction rate equation for the bellow figure reaction, If S at is present in large excess, what is the order of this reaction ?
Reaction rate equation for the bellow figure reaction, If S at is present in large excess, what is the order of this reaction ?
A. Zero
B. One
C. Two
D. Three
In the gaseous phase ammonia formation reaction (N2 + 3H2 ⇌ 2NH3), the value of the equilibrium constant depends on the_________________?
In the gaseous phase ammonia formation reaction (N2 + 3H2 ⇌ 2NH3), the value of the equilibrium constant depends on the_________________?
A. Total pressure of the system
B. Volume of the reactor
C. Temperature
D. Initial concentration of N2 and H2
For a heterogeneous catalytic reaction____________________?
For a heterogeneous catalytic reaction____________________?
A. Free energy of activation is lowered in the presence of catalyst, which remains unchanged at
the end of reaction
B. A relatively small amount of catalyst can cause the conversion of large amount of reactants
which does not mean that catalyst concentration is important
C. The catalyst does not form an intermediate complex with the reactant
D. The surface of the catalyst does not play an important role during reaction
A photochemical reaction is _______________?
A photochemical reaction is _______________?
A. Accompanied with emission of light
B. Catalysed by light
C. Initiated by light
D. All A., B. & C.
For high conversion in a highly exothermic solid catalysed reaction, use a ______________ bed reactor?
For high conversion in a highly exothermic solid catalysed reaction, use a ______________ bed reactor?
A. Fixed
B. Fluidised bed reactor followed by a fixed
C. Fixed bed reactor followed by a fluidised
D. Fluidised
Sometimes, batch process is preferred over continuous process, when the product___________________?
Sometimes, batch process is preferred over continuous process, when the product___________________?
A. Quality & yield cannot be achieved in continuous processes, because of long residence time
B. Sales demand is fluctuating
C. Both A. & B.
D. Neither A. nor B.