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.Management Sciences
Category: Chemical Reaction
In autocatalytic reactions ?
A. One of the reactants acts as a catalyst
B. One of the products acts as a catalyst
C. Catalysts have very high selectivity
D. No catalyst is used
With increase in K2/K1 in case of a unimolecular type elementary reactions as shown in the bellow figure, the fractional yield of ‘R’ in mixed reactor (for a given conversion of ‘A’) ?
A. Decreases
B. Increases
C. Increases linearly
D. Remain same
For a reaction of the type of bellow given figure, the rate of reaction (- rx) is given by___________________?
A. (K1 + K1) CX
B. (K1 + K2+K3) CX
C. K1CV – K2CX
D. (K1 – K2) CX
A batch reactor suffers from following disadvantage ?
A. Poor product quality control
B. High labour and handling cost
C. High shutdown time requirement for emptying, cleaning and refilling
D. All A., B. and C.
With an increase in pressure in gaseous phase chemical reactions, the fractional conversion ______________ when the number of moles decreases?
A. Increases
B. Decreases
C. Remain unaffected
D. Unpredictable from the data
Volume change for unimolecular type first order reaction as shown in the bellow figure, increases _____________ with time?
A. Linearly
B. Exponentially
C. Parabolically
D. Logarithmically
Which of the following resistances is not involved in a gas phase catalytic (gas-solid) reaction ?
A. Ash resistance
B. Gas film and pore surface diffusion resistances for reactants
C. Surface phenomenon resistance
D. Gas film and pore surface diffusion resistances for products
A catalyst in a chemical reaction _______________ free energy change in the reaction?
A. Increases
B. Decreases
C. Either A. or B.; depends on the type of catalyst
D. Neither A. nor B.
A catalyst is said to be a negative catalyst, if it ___________________?
A. Retards the rate of reaction
B. Reduces the value of equilibrium constant
C. Does not initiate the reaction
D. All A., B. and C.
An isothermal irreversible reaction is being carried out in an ideal tubular flow reactor. The conversion in this case will ______________ with decrease in space time?
A. Increase
B. Increase exponentially
C. Decrease
D. Remain unchanged
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