Chemical Engineering MCQs

Page No. 549

Considering the endothermic dissociation of CaCO3 in a closed vessel (CaCO3 ⇌ CaO + CO2), the pressure of CO2 increases, if____________________?


aA catalyst is added

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bThe temperature is increased

✓


cAn inert gas is pumped keeping the temperature constant

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dNone of these

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Thermodynamic equilibrium constant in a system is affected by___________________?


aInerts

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bPressure

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cTemperature

✓


dAll A., B. & C.

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View Answer Temperature

Sum of the powers of the concentration terms in the rate equation is called the _____________ of the reaction?


aOrder

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bOverall order

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cMolecularity

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dNone of these

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View Answer Overall order

The rate at which a chemical substance reacts is proportional to its _____________________?


aActive mass

✓


bMolecular weight

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cEquivalent weight

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dAtomic weight

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View Answer Active mass

Which of the following is the most suitable for isothermal operation?


aBatch reactor

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bBack-mix reactor

✓


cPlug-flow reactor

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dFixed bed reactor

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View Answer Back-mix reactor

An exothermic reaction takes place in an adiabatic reactor. The product temperature ______________ reactor feed temperature?


aIs always equal to

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bIs always greater than

✓


cIs always less than

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dMay be greater or less than

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The rate of forward reaction, at chemical equilibrium is ______________ the rate of backward reaction?


aMore than

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bLess than

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cEqual to

✓


dEither B. or C.

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View Answer Equal to

For a first order chemical reaction, the rate constant_________________?


aChanges on changing the concentration units

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bIs not a function of the unit of time

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cHas unit of time-1

✓


dNone of these

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View Answer Has unit of time-1

When the reaction occurs in the diffusion controlled region, the apparent activation energy as measured is only _______________ the true value?


aTwice

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bHalf

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cEqual

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dNone of these

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View Answer Half

Reverse reaction in a chemical equilibrium is favoured by the________________?


aRemoval of one of the products regularly

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bIncrease in the concentration of one of the products

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cIncrease in the concentration of one of the reactants

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dNone of these

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