Rate of a chemical reaction is independent of the concentration of the reactants for a ___
reaction.
a. zero order
b. 3rd order
c. consecutive
d. none of these
a. zero order
Which of the following is not a unit of reaction rate?
a. Moles formed / (surface of catalyst) (time)
b. Mole formed / (volume of catalyst) (time)
c. Moles formed / (volume of reactor) (time)
d. None of these
d. None of these
If ‘n’ is the order of reaction, then unit of rate of constant is
a. 1 / (time) (concentration)(n-1)
b. (time)-1) (concentration)(1-n)
c. (time)-1) (concentration)(-1)
d. none of these
a. 1 / (time) (concentration)(n-1)
Variables affecting the rate of homogeneous reactions are?
a. pressure and temperature only.
b. temperature and composition only.
c. pressure and composition only.
d. pressure, temperature and composition.
d. pressure, temperature and composition.
Rate determining step in a reaction consisting of a number of steps in series is the ___ step.
a. fastest
b. slowest
c. intermediate
d. data insufficient; can’t be predicted
b. slowest
Arrhenius equation shows the variation of ___ with temperature.
a. reaction rate
b. rate constant
c. energy of activation
d. frequency factor
b. rate constant
Which of the following is a controlling factor in very fast heterogeneous reaction?
a. Heat and mass transfer effects
b. Temperature
c. Pressure
d. Composition of reactant5
a. Heat and mass transfer effects
Velocity of a chemical reaction
a. decreases with increase in temperature.
b. increases with increase of pressure of reactants
for all reactions.
c. decreases with increase of reactant concentration.
d. none of these.
d. none of these.
Sum of the powers of the concentration terms in the rate equation is called the _ of the reaction.
a. order
b. molecularity
c. overall order
d. none of these
c. overall order
Molecularity of a reaction
a. is always equal to the overall order of reaction.
b. may not be equal to the order of reaction.
c. can’t have a fractional value.
d. both (b) and (c).
d. both (b) and (c).
Rate constant ‘k’ and absolute temperature ‘T’ are related by collision theory (for
bimolecular) as?
a. k α T(1/2)
b. k α exp(-Ea/RT)
c. k α √T
d. k α T
c. k α √T
A second order reaction of the form A + B → C is called a pseudo-first order reaction, when
a. CAo = CBo
b. CAo > CBo
c. CBo > CAo
d. CBo ≥ CAo
d. CBo ≥ CAo
Which of the following is the most suitable for isothermal operation?
a. Batch reactor
b. Back-mix reactor
c. Plug-flow reactor
d. Fixed bed reactor
b. Back-mix reactor
If the time required to complete a definite fraction of reaction varies inversely as the concentration of the reactants, then the order of reaction is?
a. 0
b. 1
c. 2
d. 3
c. 2
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
c. 1
Which of the following is not a chemical step in a fluid solid catalytic reaction?
a. Surface chemical reaction
b. Desorption
c. Adsorption
d. none of these
d. none of these
The rate of the chemical reaction A → B doubles as the concentration of A (i.e., CA) is doubled. If rate of reaction is proportional to CA^n, then what is the value of n for this
reaction?
a. 0.5
b. 1
c. 0
d. 2
b. 1
Half-life period of a first order irreversible reaction A → B is?
a. k/2
b. ln(2)/k
c. ln(k)/2
d. ln(0.5)/k
b. ln(2)/k
Reaction rate equation for the reaction, R + 2S → X + Y is -dCR/dt = k.CR.CS. If S is present in large excess, what is the order of this reaction?
a. one
b. two
c. zero
d. three
c. zero
The order of the reaction, H2 + Cl2 → 2HCl, is?
a. 0
b. 1
c. 2
d. 3
a. 0
The exit age distribution of fluid leaving a vessel is used to know the?
a. activation energies of a reaction
b. extent of non-ideal flow in the vessel.
c. reaction mechanism.
d. none of these
b. extent of non-ideal flow in the vessel.
Photochemical reaction rate does not depend significantly on temperature, because?
a. it is a reversible reaction.
b. the energy of reacting molecules exceeds the activation energy by absorption of light.
c. it is an exothermic reaction.
d. none
b. the energy of reacting molecules exceeds the activation energy by absorption of light.
Rate of a chemical reaction is not affected by the?
a. catalyst
b. reactant’s concentration
c. temperature
d. number of molecules of reactants taking part in the reaction
d. number of molecules of reactants taking part in the reaction
As the chemical reaction proceeds, the rate of reaction?
a. increases
b. decreases
c. remains same
d. may increase or decrease depending on the type of reaction
b. decreases
