EXAMIANS
A first order reaction A → B occurs in an isothermal porous catalyst pellet of spherical shape. If the concentration of A at the centre of the pellet is much less than at the external surface, the process is limited by
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In the hydrodealkylation of toluene to benzene, the following reactions occur:C₇H₈ + H₂ → C₆H₆ + CH₄2C₆H₆ ⇋ C₁₂H₁₀ + H₂Toluene 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
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The half life period of a first order reaction is
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In an exothermic chemical reaction, the reactants compared to the products have
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The fractional volume change of the system for the isothermal gas phase reaction, A 3B , between no conversion and complete conversion is
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For a tubular flow reactor with uniform concentration and temperature, the independent variable is
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A first order reaction is to be treated in a series of two mixed reactors. The total volume of the two reactors is minimum, when the reactors are
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In a reversible reaction, a catalyst increases the rate of forward reaction
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Exothermic reactions are best carried out in
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Enzymes (a protein) are catalysts found in organisms. Its efficiency of catalysing a reaction is due to its capacity to lower the activation energy of the reaction. The enzyme ptyalin used for food digestion is present in
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