Chemical Engineering MCQs

Page No. 581

A catalyst in a chemical reaction____________________?


aDecreases the activation energy


bAlters the reaction mechanism


cIncreases the frequency of collisions of reacting species


dAll A., B. and C.


View Answer All A., B. and C.

The following gas phase reaction is taking place in a plug flow reactor. A stoichiometric mixture of A and B at 300 K is fed to the reactor. At 1 m along the length of the reactor, the temperature is 360 K. The pressure drop is negligible and an ideal gas behaviour can be assumed. Identify the correct expression relating the concentration of A at the inlet (CA0), concentration of A at 1m (CA) and the corresponding conversion of A (X) ?


aCA = 1.2 CA0 (1 – X)/(1 – 0.33X)


bCA = 1.2 CA0 (1 – X)/(1 – 0.5X)


cCA = 0.83 CA0 (1 – X)/(1 – 0.33X)


dCA = 0.83 CA0 (1 – X)/(1 – 0.5X)



Mean residence time is equal to the space time, when_________________?


aThe feed rate is measured at temperature and pressure in the reactor


bThe temperature, pressure and the density of reaction mixture remains constant throughout the reactor


cThere is no change in number of moles in gaseous reaction


dAll A., B. and C.


View Answer All A., B. and C.

In a chemical reaction, represented by as shown in the bellow figure, it is observed that the (i) Rate of reaction increases by a factor of 4 on doubling the concentration of the reactant. (ii) Rate of reaction increases by a factor of 9 on trebling the concentration of the reactant. Then the rate of the reaction is proportional to(where, CA = concentration of the reactant)_____________________?


aCA


bCA2


cCA3


dCA4


View Answer CA2

Knudsen diffusion is directly proportional to _____________________?


aT


b√T


c1/√T


dT2


View Answer √T

Exposure of a photographic plate to produce a latent image is an example of _______________ reaction?


aVery slow


bVery fast


cPhotochemical


dBoth B. and C.


View Answer Both B. and C.

In case of calcination of limestone, CaCO3 CaO + CO2, the addition of more of CaO will result in _______________ in the concentration of CO2?


aNo change


bIncrease


cDecrease


dUnpredictable from the data


View Answer No change

The rate of the chemical reaction A → B doubles as the concentration of A i.e.., CA is doubled. If rate of reaction is proportional to CA n, then what is the value of n for this reaction ?


a0


b0.5


c1


d2


View Answer 1

Arrhenius equation shows the variation of ___________________ with temperature?


aReaction rate


bRate constant


cEnergy of activation


dFrequency factor


View Answer Rate constant

The rate constant of a chemical reaction increases by increasing the______________________?


aTemperature


bPressure


cReactant’s concentration


dNone of these


View Answer Temperature

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