CHEMICAL REACTION ENGINEERING QUIZ

Which one is the rate controlling step in a solid-gas non-catalytic reaction occurring at very high temperature?

Ash layer diffusion

Chemical reaction

Pore diffusion

Film diffusion

TRUE ANSWER : ?
YOUR ANSWER : ?

For a first order reaction carried out in a plug flow reactor, the space time is

1/K In C/C0

1/K In C0/C

K In C0/C

K In C/C0

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For a tubular reactor with space time 'τ' and residence time 'θ', the following statement holds good.

τ = θ , for an isothermic tubular reactor in which the density of the process fluid is constant

τ and θ are always equal

τ = θ , when the fluid density changes in the reactor

τ = θ , for a non-isothermal reactor

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With increase in the space time of an irreversible isothermal reaction being carried out in a P.F. reactor, the conversion will

Decrease

Remain same

Increase

Data in insufficient; can't be predicted

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Catalyst is a substance, which __________ chemical reaction.

Can either increase or decrease the speed of a

Increases the speed of a

Decreases the speed of a

Alters the value of equilibrium constant in a reversible

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The dimensions of rate constant for reaction 3A → B are (l/gm mole)/min. Therefore the reaction order is

1

2

3

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A rise in temperature

Does not affect a catalysed reaction

Does not affect photo-chemical reaction rates

All of these

Normally tends to increase the reaction rate

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Which of the following is not a dimension-less group used in catalysis ? (where, D = dispersion co-efficient, cm² /sec.D1 = diffusion co-efficient; cm²/sec L = length of the reactor, cm t = time, sec, v = volumetric flow rate, cm³/sec . V = volume, cm³.)

Reduced time (vt/V)

Reactor dispersion number (D/vL)

None of these

Thiele modulus (L√(k/D1)

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The 'E' curve for a non-ideal reactor defines the fraction of fluid having age between t and t + dt

At the outlet

Averaged over the inlet and outlet

At the inlet

In the reactor

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In the converter of the contact process for the manufacture of H₂SO₄ the equilibrium conversion of SO₂ (i) with increase in temperature and (ii) with increase in the mole ratio of SO₂ to air.

(i) increases (ii) increases

(i) increases (ii) decreases

(i) decreases (ii) increases

(i) decreases (ii) decreases

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