For a heterogeneous catalytic reaction, A + B → C, with equimole feed of A and B, the initial rate – rA0 is invariant with total pressure. The rate controlling step is______________________?

A. Surface Kc/(1 + TS) reaction between absorbed A and B in the gas phase
B. Surface reaction between absorbed A and absorbed B
C. Surface reaction between A in the gas phase and absorbed B
D. Desorption of C

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

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

The irreversible reaction, X → Y, is the special case of the reversible reaction, X ⇌ Y, in which the _____________________?

A. Equilibrium constant is infinite
B. Fractional conversion of ‘A’ at equilibrium is unity
C. Concentration of ‘A’ at equilibrium is zero
D. All A., B. and C.

For identical flow rate and feed composition, X plug flow reactors (PER) in series with a total volume V gives the same conversion as single_______________?

A. CSTR of volume V
B. PFR of volume V
C. CSTR of volume V/X
D. PFR of volume V/X

Fractional conversion _________________ for an exothermic reversible chemical reaction, when the temperature is maximum?

A. Increases
B. Remains unchanged
C. Decreases
D. Unpredictable from the data

Overall rate of reaction in a heterogeneous catalytic reaction depends upon the mass and energy transfer from the fluid to solid surface and its rate of reaction is usually ________________ the concentration of catalyst, if it does not entail a chain mechanism?

A. Proportional to
B. Independent of
C. Inversely proportional to
D. Proportional to the square of

For a packed bed reactor; the presence of a long tail in the residence time distribution curve is an indication of ?

A. Ideal plug flow
B. Bypass
C. Dead zone
D. Channelling

The use of space time is preferred over the mean residence time in the design of a/an____________________?

A. Batch reactor
B. Ideal tubular-flow reactor
C. Slurry reactor
D. CSTR

A first order reaction A → B occurs in an isothermal porous catalyst pellet of spherical shape. If the concentration of A at the centre of the pellet is much less than at the external surface, the process is limited by__________________?

A. Diffusion within the pellet
B. Reaction
C. External mass transfer
D. None of the above