Catalyst carriers Increase the activity of a catalyst Have very high selectivity Inhibit catalyst poisoning Provide large surface area with a small amount of active material TRUE ANSWER : ? YOUR ANSWER : ?
Photochemical reaction rate does not depend significantly on temperature, because It is an exothermic reaction The energy of reacting molecules exceeds the activation energy by absorption of light It is a reversible reaction None of these TRUE ANSWER : ? YOUR ANSWER : ?
The conversion for a first order liquid phase reaction. A → B in a CSTR is 50%. If another CSTR of the same volume is connected in series, then the % conversion at the exit of the second reactor will be 60 90 100 75 TRUE ANSWER : ? YOUR ANSWER : ?
If the rate of a chemical reaction becomes slower at a given temperature, then the Initial concentration of the reactants remains constant Free energy of activation is lower Entropy changes Free energy of activation is higher TRUE ANSWER : ? YOUR ANSWER : ?
Slurry reactors are characterised by the Neither A nor B Presence of two mobile phases Lack of intraparticle diffusion resistance Both A and B TRUE ANSWER : ? YOUR ANSWER : ?
The fractional volume change of the system for the isothermal gas phase reaction, A 3B , between no conversion and complete conversion is 1 3 2 0.5 TRUE ANSWER : ? YOUR ANSWER : ?
For a tubular reactor with space time 'τ' and residence time 'θ', the following statement holds good. τ and θ are always equal τ = θ , for a non-isothermal reactor τ = θ , for an isothermic tubular reactor in which the density of the process fluid is constant τ = θ , when the fluid density changes in the reactor TRUE ANSWER : ? YOUR ANSWER : ?
An irreversible first order reaction is being carried out in a CSTR and PFR of same volume. The liquid flow rates are same. The relative conversion will Be more in PFR than in CSTR Be same in both cases Depend on the temperature Be more in CSTR than in PFR TRUE ANSWER : ? YOUR ANSWER : ?
In an ideal P.F.R. at steady state conditions The composition of reactants remains constant along a flow path There is no lateral mixing of fluid There may be diffusion along the flow path The conversion of the reactant varies from point to point along a flow path TRUE ANSWER : ? YOUR ANSWER : ?
__________ gas is normally employed in B.E.T.method of finding out the surface area of catalyst. CO₂ H₂ N₂ He TRUE ANSWER : ? YOUR ANSWER : ?