391. A photochemical reaction is
Accompanied with emission of light
Catalysed by light
Initiated by light
All of the above
✅ The correct answer is option C.
Chemical Reaction Engineering MCQs
392. The ratio of moles of a reactant converted into the desired product to that converted into unwanted product is called
Operational yield
Relative yield
Selectivity
None of these
✅ The correct answer is option C.
393. Half life period of a first order irreversible reaction A → B is
K/2
Ln k/2
Ln 2/k
Ln 0.5/k
✅ The correct answer is option C.
394. If CA is the quantity of reactants initially present, the quantity left after ‘n’ half periods will be equal to
(CA)n
(1/2)n.CA
(CA)1/n
(CA)1/2n
✅ The correct answer is option B.
395. Helium-mercury method is used for the measurement of the __________ of the catalyst.
Surface area
Porosity
Pore volume
Both B & C
✅ The correct answer is option D.
396. Rate of a chemical reaction is not influenced by the
Catalyst
Temperature
Reactants concentration
Number of molecules of reactants taking part in a reaction
✅ The correct answer is option D.
397. Rate determining step in a reaction consisting of a number of steps in series is the __________ step.
Fastest
Slowest
Intermediate
Data insufficient; can’t be predicted
✅ The correct answer is option B.
398. When a high liquid hold up is required in a reactor for gas liquid reaction, use __________ coloumn.
Packed
Spray
Tray
Bubble
✅ The correct answer is option D.
399. Space time equals the mean residence time
When the density of the reaction mixture is constant
For large diameter tubular reactor
For narrow diameter tubular reactor
For CSTR
✅ The correct answer is option A.
400. Cold shot cooling is only practical when the feed temperature is __________ than the reaction temperature.
Higher
Much higher
Lower
Much lower
✅ The correct answer is option D.