CHEMICAL REACTION ENGINEERING QUIZ

In the gaseous phase ammonia formation reaction (N₂ + 3H₂ ⇋ 2NH₃), the value of the equilibrium constant depends on the

Volume of the reactor

Initial concentration of N₂ and H₂

Total pressure of the system

Temperature

TRUE ANSWER : ?
YOUR ANSWER : ?

Collision theory gives the rate constant for bimolecular reaction as

K α eE/RT

None of these

K α e-E/RT

K α √T.e-E/RT

TRUE ANSWER : ?
YOUR ANSWER : ?

The rate of the reaction, X → Y, quadruples when the concentration of 'X' is doubled. The rate expression for the reaction is, r = K Cxn, the value of 'n' in this case will be

1

2

3

TRUE ANSWER : ?
YOUR ANSWER : ?

For series reaction, the relative yield

Both A and C hold good

Decreases with increasing conversion

Is always greater for plug-flow reactor than for the single CSTR of the same volume

Statement in A is wrong

TRUE ANSWER : ?
YOUR ANSWER : ?

A first order reaction requires two equal sized CSTR. The conversion is

More when they are connected in parallel

Less when they are connected in series

Same whether they are connected in series or in parallel

More when they are connected in series

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following is not endothermic in nature?

Gasification of carbon

Combustion of sulphur

Steam reforming of naphtha

Thermal cracking of fuel oil

TRUE ANSWER : ?
YOUR ANSWER : ?

A reaction which is catalysed by an acid is also catalysed by any substance, which has a tendency to

Gain a proton

None of these

Lose an electron

Lose a proton

TRUE ANSWER : ?
YOUR ANSWER : ?

The most unsuitable reactor for carrying out reactions in which high reactant concentration favours high yields is

PFR in series

Series of CSTR

Plug flow reactor

Backmix reactor

TRUE ANSWER : ?
YOUR ANSWER : ?

Velocity of a reaction depends upon the

Nature of the reactants

Temperature at which the reaction is carried

Concentration of the reactants

All of these

TRUE ANSWER : ?
YOUR ANSWER : ?

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 Arrhenious law is used. What will be this ratio, if transition state theory is used with the same value of E/R?

2.5

2

1.6

2.24

TRUE ANSWER : ?
YOUR ANSWER : ?

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