Category: Chemical Reaction

For every 10°C rise in temperature, the rate of chemical reaction doubles. When the temperature is increased from 30 to 70°C, the rate of reaction increases ______________ times?

Hamad Chemical Reaction 05/10/2021

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A. 8
B. 12
C. 16
D. 32

Specific rate constant for a second order reaction__________________?

Hamad Chemical Reaction 05/10/2021

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A. Is independent of temperature
B. Varies with temperature
C. Depends on the nature of the reactants
D. Both B. and C.

Enzymes are destroyed, when the_______________?

Hamad Chemical Reaction 01/10/2021

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A. Temperature is very high
B. Reactant’s concentration is very high
C. Reactant’s concentration is very low
D. Reaction rate is independent of the reactant’s concentration

Reactions with high activation energy are_____________________?

Hamad Chemical Reaction 30/09/2021

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A. Very temperature sensitive
B. Temperature insensitive
C. Always irreversible
D. Always reversible

The reason why a catalyst increases the rate of reaction is that, it______________?

Hamad Chemical Reaction 27/09/2021

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A. Decreases the energy barrier for reaction
B. Increases the activation energy
C. Decreases the molecular collision diameter
D. None of these

The reaction rate constants at two different temperatures T1 and T2 are related by _________________?

Hamad Chemical Reaction 26/09/2021

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A. ln (k2/k1) = (E/R) (1/T2 – 1/T1)
B. ln (k2/k1) = (E/R) (1/T1 – 1/T2)
C. exp (k2/k1) = (E/R) (1/T2 – 1/T1)
D. exp (k2/k1) = (E/R) (1/T1 – 1/T2)

The exit age distribution of fluid leaving a vessel is used to know the__________________?

Hamad Chemical Reaction 21/09/2021

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A. Activation energies of a reaction
B. Reaction mechanism
C. Extent of non-ideal flow in the vessel
D. None of these

The reaction A → B is conducted in an adiabatic plug flow reactor (PFR). Pure A at a concentration of 2 kmol/m3is fed to the reactor at the rate of 0.01 m3 /s and at a temperature of 500 K. If the exit conversion is 20%, then the exit temperature (in k) is (Data: Heat of reaction at 298 K = – 50000 kJ/ kmole of A reacted Heat capacities CPA = CPB = 100kJ/kmole. K (may be assumed to be independent of temperature)) ?

Hamad Chemical Reaction 18/09/2021

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A. 400
B. 500
C. 600
D. 1000

Which of the following will give maximum gas conversion ?

Hamad Chemical Reaction 17/09/2021

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A. Fixed bed reactor
B. Fluidised bed reactor
C. Semi-fluidised bed reactor
D. Plug-flow catalytic reactor

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

Hamad Chemical Reaction 15/09/2021

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A. Twice
B. Half
C. Equal
D. None of these