Practice Pakistan's most useful MCQs for competitive exams

In a continuous flow stirred tank reactor, the composition of the exit stream_________________?

• (A)  Is same as that in the reactor
• (B)  Is different than that in the reactor
• (C)  Depends upon the flow rate of inlet stream
• (D)  None of these

Answer

Submitted By :Ali Uppal

Kinetics of a catalytic reaction can be best studied on a/an ______________ reactor?

• (A)  Mixed
• (B)  Integral (plug flow)
• (C)  Differential (flow)
• (D)  Either

Answer

Submitted By :Ali Uppal

Equilibrium of a chemical reaction as viewed by kinetics is a ______________ state?

• (A)  Dynamic steady
• (B)  Static steady
• (C)  Dynamic unsteady
• (D)  None of these

Answer

Submitted By :Ali Uppal

A pollutant P degrades according to first order kinetics. An aqueous stream containing P at 2 kmole/m3 and volumetric flow rate 1m3 /h requires a mixed flow reactor of volume V to bring down the pollutant level to 0.5 kmole/m3. The inlet concentration of the pollutant is now doubled and the volumetric flow rate is tripled. If the pollutant level is to be brought down to the same level of 0.5 k.mole/m3, the volume of the mixed flow reactor should be increased by a factor of_______________?

• (A)  7
• (B)  6
• (C)  3
• (D)  7/3

Answer

Submitted By :Ali Uppal

Rate of a chemical reaction is not influenced by the__________________?

• (A)  Catalyst
• (B)  Temperature
• (C)  Reactants concentration
• (D)  Number of molecules of reactants taking part in a reaction

Answer

Submitted By :Ali Uppal

The irreversible reaction is a special case of reversible reaction, if the________________?

• (A)  Equilibrium constant is 1
• (B)  Conversion of the reactant at equilibrium condition is zero
• (C)  Reactant concentration at equilibrium condition is zero
• (D)  All

Answer

Submitted By :Ali Uppal

A catalyst is said to be a negative catalyst, if it ___________________?

• (A)  Retards the rate of reaction
• (B)  Reduces the value of equilibrium constant
• (C)  Does not initiate the reaction
• (D)  All

Answer

Submitted By :Ali Uppal

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

Answer

Submitted By :Ali Uppal

The excess energy of reactants in a chemical reaction required to dissociate into products is termed as the _______________ energy?

• (A)  Activation
• (B)  Potential
• (C)  Binding
• (D)  Threshold

Answer

Submitted By :Ali Uppal

The response curve for a step input signal from a reactor is called C-curve. The variance of C-curve in a ‘tanks in series model’ comprising of ‘m’ tanks is equal to ___________________?

• (A)  m
• (B)  1/m
• (C)  √m
• (D)  m2

Answer

Submitted By :Ali Uppal