A catalyst initiates a reaction. lowers the activation energy of reacting molecu

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Question
A catalyst
Options
A. initiates a reaction.
B. lowers the activation energy of reacting molecules.
C. is capable of reacting with any one of the reactants.
D. can not be recovered chemically unchanged at the end of a chemical reaction.

Correct Answer

lowers the activation energy of reacting molecules.

Chemical Reaction Engineering problems

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1. Fractional conversion __________ with increase in pressure for ammonia synthesis reaction i.e., N₂ + 3H₂ ⇌ 2NH₃.
Options
A. increases
B. decreases
C. remains unchanged
D. unpredictable from the data

3. A reactor is generally termed as an autoclave, when it is a
Options
A. high pressure batch reactor.
B. atmospheric pressure tank reactor.
C. high pressure tubular reactor.
D. atmospheric pressure CSTR.

5. Pick out the wrong statement.
Options
A. The vessel dispersion number (D/UL) for plug flow and mixed flow approaches zero and infinity respectively.
B. Space time in a flow reactor is a measure of its capacity and is equal to the residence time when the density of reaction mixture is constant.
C. Mixed reactor is always smaller than the plug flow reactor for all positive reaction orders for a particular duty.
D. In an ideal tubular flow reactor, mixing takes place in radial direction and there is no mixing in logitudinal direction.

7. A first order irreversible reaction, A → B is carried out separately in a constant volume as well as in a variable volume reactor for a particular period. It signifies that __________ in the two reactors.
Options
A. both conversion as well as concentration are same
B. conversion in both will be the same but concentrations will be different
C. both the conversion as well as concentrations will be different
D. none of these.

9. 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.
Options
A. 8
B. 12
C. 16
D. 32

10. The increase in the rate of reaction with temperature is due to
Options
A. increase in the number of effective collisions.
B. decrease in activation energy.
C. increase in the average kinetic energy of the reacting molecules.
D. none of these.

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