The rate constant of a chemical reaction increases by increasing the
A. Temperature
B. Pressure
C. Reactant's concentration
D. None of these
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Knudsen diffusion is directly proportional to
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Pure A in gas phase enters a reactor 50% of this A is converted to B through the reaction, A → 3B. Mole fraction of A in the exit stream is
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For a solid catalysed chemical reaction, the effectiveness of solid catalyst depends upon the __________ adsorption.
A. Physical
B. Chemical
C. Both A and B
D. Neither A nor B
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When a catalyst increases the rate of forward reaction, the value of rate constant
A. Increases
B. Decreases
C. Remain same
D. Becomes infinite
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In the hydrodealkylation of toluene to benzene, the following reactions occur:
C7 H8 + H2 → C6 H6 + CH4
2C6 H6 ⇋ C12 H10 + H2
Toluene and hydrogen are fed to a reactor in a molar ratio 1 : 5.80% of the toluene gets converted and the selectivity of benzene (defined as moles of benzene formed/moles of toluene converted) is 90%. The fractional conversion of hydrogen is
A. 0.16
B. 0.144
C. 0.152
D. 0.136
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Half-life period for a first order reaction is __________ the initial concentration of the reactant.
A. Directly proportional to
B. Inversely proportional to
C. Independent of
D. None of these
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What is the order of a chemical reaction whose rate is deter-mined by the variation of one concentration term only?
A. Zero
B. First
C. Second
D. Third
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Which of the following curves shows the effect of temperature on the extent of gas-solid adsorption at a given pressure?
A. Langmuir adsorption isotherm
B. Adsorption isobar
C. Freundlich adsorption isotherm
D. None of these
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Transition state theory gives the rate constant as
A. K α e − RT E
B. K α e RT E
C. K α T . e − RT E
D. Select an option to see the answer and solution.
A plug-flow reactor is characterised by
A. High capacity
B. Presence of axial mixing
C. Presence of lateral mixing
D. Constant composition and temperature of reaction mixture
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Pick out the correct statement
A. Reactions with high activation energies are very temperature sensitive
B. Chemical equilibrium is a static state
C. A photochemical reaction is catalysed by light
D. A chemical reaction occurs when the energy of the reacting molecule is less than the activation energy of the reaction
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On application of pressure to the equilibrium system, ice ⇋ water; which of the following phenomenon will occur?
A. Water will evaporate
B. Equilibrium will not be attained
C. More ice will be formed
D. More water will be formed
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The excess energy of the reactants required to dissociate into products is known as the __________ energy.
A. Thermal
B. Activation
C. Threshold
D. Binding
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Radioactive decay follows __________ order kinetics.
A. First
B. Second
C. Third
D. Zero
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__________ is the response curve for a step input signal from a reactor.
A. S-curve
B. C-curve
C. I-curve
D. None of these
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The conversion in a mixed reactor/accomplishing a reaction A 3R is 50% when gaseous reactant 'A' is introduced at the rate of 1 litre/second and the leaving flow rate is 2 litres/second. The holding time for this operation is __________ second.
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Pick out the wrong statement.
A. Use of different catalysts in a reversible catalytic chemical reaction does not change the equilibrium composition
B. Alumina is added as a promoter to iron catalyst in ammonia synthesis reaction
C. Activation energy for a reaction is obtained from the intercept of the Ar-rhenious plot
D. Presence of inerts affects the equilibrium conversion of reactants in a chemical reaction
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Pick out the wrong statement.
A. A catalyst does not alter the final position of equilibrium in a reversible reaction
B. A catalyst initiates a reaction
C. A catalyst is specific in reaction
D. A catalyst remains unchanged in chemical composition at the end the reaction
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Pick out the wrong statement.
A. A particular chemical reaction is more temperature sensitive at low temperatures
B. A very high value of equilibrium constant, K (K >> 1) indicates that the reaction is practically irreversible in nature
C. The intercept of the Arrhenious plot is called the 'activation energy'
D. Non-ideal flow takes place in reactors due to recycling, channeling or by creation of stagnant regions
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