A first order gaseous phase reaction is catalysed by a non-porous solid. The kinetic rate constant and the external mass transfer co-efficients are k and k g e ff) is given by
A. k e ff = k + k g
B. k e ff = 2 k + k g
C. k e ff = ( k k g ) 2 1
D. k e ff 1 = k 1 + k g 1
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The half life period of a first order reaction is given by (where, K = rate constant. )
A. 1.5 K
B. 2.5 K
C. K 0.693
D. 6.93 K
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Catalyst is a substance, which __________ chemical reaction.
A. Increases the speed of a
B. Decreases the speed of a
C. Can either increase or decrease the speed of a
D. Alters the value of equilibrium constant in a reversible
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A chemical reaction is of zero order, when the reaction rate is (where, CA = concentration of reactant)
A. ∝ CA
B. ∝ CA 1
C. Independent of temperature
D. None of these
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Higher free energy of activation of a chemical reaction (at a given temperature) implies
A. Slower rate of reaction
B. Higher rate of reaction
C. Higher equilibrium conversion
D. Both B and C
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If the rate of a chemical reaction becomes slower at a given temperature, then the
A. Initial concentration of the reactants remains constant
B. Free energy of activation is lower
C. Entropy changes
D. Free energy of activation is higher
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The eddy diffusivity for a liquid in plug flow must be
A. 1
B. 0
C. ∞
D. Between 0 and 1
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The most suitable reactor for carrying out an auto-thermal reaction is a
A. Batch reactor
B. CSTR
C. Semi-batch reactor
D. Plug-flow reactor
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In an ideal tubular-flow reactor
A. There is no mixing in longitudinal direction
B. Mixing takes place in radial direction
C. There is a uniform velocity across the radius
D. All of the above
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A reactor is generally termed as an autoclave, when it is a
A. High pressure batch reactor
B. Atmospheric pressure tank reactor
C. High pressure tubular reactor
D. Atmospheric pressure CSTR
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A batch reactor is suitable for
A. Achieving cent percent conversion of reactants into products
B. Large scale gaseous phase reactions
C. Liquid phase reactions
D. Obtaining uniform polymerisation products in highly exothermic reactions
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If Thiele modulus is __________ , then the pore diffusion resistance in a catalyst may be considered as negligible.
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Which of the following chemical reactions will be favoured by low pressure?
A. 2HI ⇋ H2 + I2
B. N2 O2 ⇋ 2NO2
C. N2 + O2 ⇋ 2NO
D. None of these
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A trickle bed reactor is the one, which
A. Has altogether three streams either entering or leaving
B. Processes three reactants at different flow rates
C. Processes three reactants with same flow rate
D. Employs all the three phases (i.e.. .solid, liquid and gas)
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Study of chemical kinetics is the easiest in the case of __________ reactions.
A. Irreversible
B. Reversible
C. Surface
D. Side
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The catalyst in a first order chemical reaction changes the
A. Equilibrium constant
B. Activation energy
C. Heat of formation of the product
D. Heat of reaction
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Limiting reactant in a chemical reaction decides the
A. Rate constant
B. Conversion
C. Reaction speed
D. Equilibrium constant
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In an exothermic chemical reaction, the reactants compared to the products have
A. Higher temperature
B. More energy
C. Less energy
D. Same energy
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An isothermal aqueous phase reversible reaction, P ⇋ R, is to be carried out in a mixed flow reactor. The reaction rate in k.mole/m3 .h is given by, r = 0.5CP - 0.125CR . A stream containing only P enters the
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The time needed to achieve the same fractional conversion for particles of different sizes (d) when chemical reaction controls, is proportional to
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