7661. In an exothermic chemical reaction, the reactants compared to the products have
Higher temperature
More energy
Less energy
Same energy
✅ The correct answer is option B.
Chemical Engineering
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7662. If the rate of a chemical reaction becomes slower at a given temperature, then the
Initial concentration of the reactants remains constant
Free energy of activation is lower
Entropy changes
Free energy of activation is higher
✅ The correct answer is option D.
7663. From among the following, choose one which is not an exothermic process.
Methanol synthesis
Catalytic cracking
Ammonia synthesis
Oxidation of sulphur
✅ The correct answer is option B.
7664. If n = overall order of a chemical reaction. a = initial concentration of reactant. t = time required to complete a definite fraction of the reaction. Then pick out the correct relationship.
T ∝ 1/an
T ∝ 1/an – 1
T ∝ 1/an + 1
T ∝ an
✅ The correct answer is option B.
7665. There is no correspondence between stoichiometry and the rate equation in case of a/an __________ reaction.
Elementary
Multiple
Autocatalytic
Non-elementary
✅ The correct answer is option D.
7666. For an ideal plug flow reactor, the value of Peclet number is
0
∞
1
10
✅ The correct answer is option B.
7667. The catalyst in a second order reversible reaction increases the rate of the forward reaction
And decreases that of backward reaction
And backward reaction equally
Only
To a greater extent than that of the backward reaction
✅ The correct answer is option B.
7668. For a mixed flow reactor operating at steady state, the rate of reaction is given by
FA0/V – dCsub>A/dt
FA0/V + dCsub>A/dt
FA0/V . Xsub>A
✅ The correct answer is option C.
7670. Overall rate of reaction in a heterogenous catalytic reaction depends upon the mass and energy transfer from the fluid to solid surface and its rate of reaction is usually __________ the concentration of catalyst, if it does not entail a chain mechanism.
Proportional to
Independent of
Inversely proportional to
Proportional to the square of
✅ The correct answer is option A.