Chemical Reaction Subcategories

Chemical Reaction

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.

For an autocatalytic reactor, the suitable reactor set up is__________________?

A. P.F. reactors in series
B. CSTR in series
C. CSTR followed by P.F. reactor
D. P.F. reactor followed by CSTR

In a reaction, the threshold energy is equal to (where, A = activation energy N = normal energy of reactants) ?

A. A
B. N
C. A + N
D. A – N

Recycling back of outlet stream to the reactor from an ideal CSTR carrying out a first order liquid phase reaction will result in ______________ in conversion?

A. Decrease
B. Increase
C. No change
D. Either A. or B., depends on the type of reaction

Pure ethanol vapor is fed to a reactor packed with alumina catalyst, at the rate of 100 kmole / hr. The reactor products comprise: ethylene: 95 kmole / hr, water vapour: 97.5 k mole / hr and diethyl ether: 2.5 kmole/hr. The reactions occuring can be represented by: C2H5OH → C2H4 + H2O 2C2H5OH → C2H5 – O – C2H5 + H2O The percent conversion of ethanol in the reactor is________________?

A. 100
B. 97.5
C. 95
D. 2.5

At a given value of E/R (ratio of activation energy and gas constant), the ratio of the rate constants at 500°K and 400°K is 2, if Arrhenius law is used. What will be this ratio, if transition state theory is used with the same value of „E/R‟ ?

A. 1.6
B. 2
C. 2.24
D. 2.5

For reactions in parallel viz A → P (desired product) and A → Q (unwanted product), if the order of the desired reaction is higher than that of the undesired reaction, a_________________?

A. Batch reactor is preferred over a single CSTR for high yield
B. Tubular reactor is preferred over a single CSTR for high yield
C. Both A. and B.
D. Single CSTR is the most suitable

In a/an ______________ reactor, there is exchange of heat with the surroundings with sizeable temperature variation?

A. Adiabatic
B. Isothermal
C. Non-adiabatic
D. None of these

Space time equals the mean residence time__________________?

A. When the density of the reaction mixture is constant
B. For large diameter tubular reactor
C. For narrow diameter tubular reactor
D. For CSTR

The effect of increasing pressure on the gaseous equilibrium of the reaction 2X + 3Y ⇌ 3X + 2Y indicates that____________________?

A. Pressure has no effect
B. Backward reaction is favoured
C. Forward reaction is favoured
D. None of these