Chemical Engineering Archives

7801. The experimentally determined overall order of the reaction, A + B → C + D, is two. Then the

Reaction is elementary with a molecularity of 2

Molecularity of the reaction is 2, but the reaction may not be elementary

Reaction may be elementary with molecularity of 2

Reaction is elementary but the molecularity may not be 2

✅ The correct answer is option A.

7802. BET apparatus is used to determine the

Specific surface of a porous catalyst

Pore size distribution

Pore diameter

Porosity of the catalyst bed

✅ The correct answer is option A.

7803. Rate of a chemical reaction is independent of the concentration of the reactants for a __________ reaction.

Zero order

Third order

Consecutive

None of these

✅ The correct answer is option A.

7804. For a heterogeneous catalytic reaction

Free energy of activation is lowered in the presence of catalyst, which remains unchanged at the end of reaction

A relatively small amount of catalyst can cause the conversion of large amount of reactants which does not mean that catalyst concentration is important

The catalyst does not form an intermediate complex with the reactant

The surface of the catalyst does not play an important role during reaction

✅ The correct answer is option A.

7805. A Catalyst

Increases the equilibrium concentration of the product

Changes the equilibrium constant of the reaction

Shortens the time to reach the equilibrium

None of these

✅ The correct answer is option C.

7806. When a catalyst increases the rate of chemical reaction, the rate constant

Decreases

Increases

Remains constant

Becomes infinite

✅ The correct answer is option B.

7807. For any reaction, we may write conversion as a function of

Time

Temperature

Concentration

All of the above

✅ The correct answer is option D.

7808. The equilibrium constant of a catalytic chemical reaction __________ due to the presence of a catalyst.

Increases

Decreases

Remains unaffected

Unpredictable from the data

✅ The correct answer is option C.

7809. In a first order reaction, the time required to reduce the concentration of reactant from 1 mole/litre to 0.5 mole/litre will be __________ that required to reduce it from 10 moles/litre to 5 moles/litre in the same volume.

More than

Less than

Same as

Data insufficient; can’t be predicted

✅ The correct answer is option C.

7810. If ΔG (free energy change) for a chemical reaction is very large and negative, then the reaction is

Not feasible

Just feasible

Very much feasible

Unpredictable as ΔG is no measure of feasibility of a reaction

✅ The correct answer is option C.