17751. The rate expression for a heterogenous catalytic reaction is given by, - rA = K.KA PA(1 + KA.PA + KR.PR), where K is surface reaction rate constant and KA and KR are absorption equilibrium constants of A and R respectively. If KR PR >> (1 + KA PA), the apparent activation energy EA is equal to (given E is the activation energy for the reaction and ΔHR and ΔHA are the activation energies of adsorption of R and A)
17752. Given,
3H2 + CO = CH4 + H2O, KP = 101.84 and,
4H2 + CO2 = CH4 + 2H2O, KP = 101.17
the KP for the reaction CO + H2O = CO2 + H2 is
17753. Differential method for analysing the kinetic data is used
17754. In case of the irreversible unimolecular type, first order reaction, the fractional conversion at any time for constant volume system as compared to variable volume system is
17755. The reaction in which the rate equation corresponds to a stoichiometric equation, is called a/an __________ reaction.
17756. The reaction A B is conducted in an isothermal batch reactor. If the conversion of A increases linearly with holding time, then the order of the reaction is
17757. 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 kg respectively. The effective rate constant (keff) is given by
17758. Arrhenious equation represents graphically the variation between the __________ and temperature.
17759. __________ catalytic reaction is involved in the thermal cracking of gas oil.
17760. Variables affecting the rate of homogeneous reactions are
17761. A chemical reaction occurs when the energy of the reacting molecules is __________ the activation energy of the reaction.
17762. Which of the following resistances is not involved in a gas phase catalytic (gas-solid) reaction ?
17763. If the time required to change the concentration of reactant to half its original value is independent of the initial concentration, the order of reaction is
17764. A batch adiabatic reactor at an initial temperature of 373°K is being used for the reaction, A B. Assume the heat of reaction is - 1kJ/mole at 373°K and heat capacity of both A and B to be constant and equal to 50J/mole.K. The temperature rise after a conversion of 0.5 will be
17765. The National Stock Exchange of India is located at?
17766. A photochemical reaction is
17767. Which is the most prevalent form of unemployment in India?
17768. The optimum performance for reactors operating in parallel is obtained when the feed stream is distributed in such a way, that the
17769. A catalyst is said to be a negative catalyst, ifit
17770. For the non catalytic reaction of particles with surrounding fluid, the same needed to achive the same fractional conversion for particles of different unchanging sizes is proportional to the particle diameter, when the __________ is the controlling resistance.
17771. Pure ethanol vapor is fed to a reactor packed with alumina catalyst, at the rate of 100 kmole / hr. The reactor products comprise: ethylene :95 kmole / hr, water vapour: 97.5 k mole / hr and diethyl ether :2.5 kmole/hr. The reactions occuring can be represented by:
C2H5OH C2H4 + H2O
2C2H5OH C2H5 - O - C2H5 + H2O
The percent conversion of ethanol in the reactor is
17772. ‘Princes of Wales Cup’ is associated with the game of .........?
17773. In the expansion of CORE banking,letter R stands for
17774. A backmix reactor
17775. Rate of a chemical reaction is not influenced by the
17776. Standard assets require a provision of
17777. The reaction A B is conducted in an adiabatic plug flow reactor (PFR). Pure A at a concentration of 2 kmol/m3 is fed to the reactor at the rate of 0.01 m3 /s and at a temperature of 500 K. If the exit conversion is 20%, then the exit temperature (in k)is (Data: Heat of reaction at 298 K = - 50000 kJ/ kmole of A reacted Heat capacities CPA = CPB = 100kJ/kmole. K (may be assumed to be independent of temperature))
17778. Which of the following is not a theory of homogeneous reaction?
17779. A first order homogeneous reaction of the type X Y Z (consecutive reaction) is carried out in a CSTR. Which of the following curves respectively show the variation of the concentration of X, Y and Z with time?
17780. In a semi-batch reactor,
17781. Most important characteristics of gas-liquid reactors are the
17782. Which of the following is a controlling factor in very fast heterogeneous reaction ?
17783. Enzymes are destroyed, when the
17784. For an autocatalytic reactor, the suitable reactor set up is
17785. Ionic reactions occur in
17786. Sometimes, batch process is preferred over continuous process, when the product
17787. In a chemical reaction , it is observed that the
(i) rate of formation of 'P' is doubled on doubling the concentration of 'X'.
(ii) rate of formation of 'P' is quadrupled on doubling the concentration of 'Y'.
(iii) doubling the concentration of 'Z' does not affect the rate of formation of 'P'.
What is the order of the above chemical reaction?
17788. The half life period of a first order reaction is given by (where, K = rate constant. )
17789. Half life period of a chemical reaction is
17790. In the gaseous phase ammonia formation reaction (N2 + 3H2 2NH3), the value of the equilibrium constant depends on the
17791. Transition state theory relates the above quantities as
17792. Photochemical reaction rate does not depend significantly on temperature, because
17793. A CSTR is to be designed in which an exothermic liquid phase first order reaction of the type, A R, is taking place. The reactor is to be provided with a jacket in which coolant is flowing. Following data is given: CA0= 5 kmole/m3 ; XA = 0.5; Feed temperature = reactor temperature = 40°C. Rate constant at 40°C = 1 min-1 ; (ΔH) = - 40kJ/mole; ρ = 1000kg/m3 CP = 4 J/gm.°C ; q = 10-3 m3/min (ρ and CP are same for the reactant and product streams). The amount of heat to be removed is
17794. According to the 'law of mass action', the rate of reaction is directly proportional to the
17795. In a chemical reaction, __________ are conserved.
17796. For an ideal gas mixture undergoing a reversible gaseous phase chemical reaction, the equilibrium constant
17797. In the reversible reaction of the type, A + B AB, in general
17798. A batch reactor is
17799. The ozone layerof atmosphere absorbs?
17800. For an isothermal second order aqueous phase reaction, A B, the ratio of the time required for 90% conversion to the time required for 45% conversion is