251. In an exothermic reaction, the energy of the reacting substances as compared to that of products is
252. For a tubular flow reactor with uniform concentration and temperature, the independent variable is
253. Rights co- exist with ......... in a democratic country?
254. The extent of a reaction is
255. Higher free energy of activation of a chemical reaction (at a given temperature) implies
256. Calcination reaction of limestone (CaCO3 CaO + CO2) goes to completion in the rotary kiln, because
257. The reactions with low activation energy are
258. Molecularity of an elementary reaction, P + Q R + S is
259. Which of the following is not endothermic in nature ?
260. Magnetic tape is not practical for applications where data must be quickly recalled because tape is?
261. The space time is equivalent to the holding time in a steady state mixed reactor for
262. The dispersion number of perfect mixed flow is
263. For the reaction , the rate of formation of Z is 0.2 gm mole/litre.hr. what is the rate of disappearance of X in gm mole/litre. hr ?
264. An irreversible aqueous phase reaction, A + B P, is carried out in an adiabatic mixed flow reactor. A feed containing 4kmole/m3 of each A and B enters the reactor at 8m3 /hr. If the temperature of the exit stream is never to exceed 390 K, what is the maximum inlet feed temperature allowed?
Data: Heat of reaction = - 50 kJ/mole
Density of the reacting mixture = 1000kg/m3
Specific heat of reacting mixture = 2kJ/kg.K
The above data can be assumed to be independent of temperature and composition.
265. For a heterogenous catalytic reaction, A + B C, with equimole feed of A and B, the initial rate - rA0 is invariant with total pressure. The rate controlling step is
266. Half life period of a first order irreversible reaction A B is
267. Which of the following is not a dimension-less group used in catalysis ? (where, D = dispersion co-efficient, cm2 /sec.D1 = diffusion co-efficient; cm2/sec L = length of the reactor, cm t = time, sec, v = volumetric flow rate, cm3/sec . V = volume, cm3.)
268. The energy of activation of a chemical reaction
269. Chemical kinetics can predict the __________ of a chemical reaction.
270. Which of the following fixes the volume of a batch reactor for a particular conversion and production rate ?
271. Volume change for unimolecular type first order reaction , increases __________ with time.
272. Half life period of decomposition of a liquid 'A' by irreversible first order reaction is 12 minutes. The time required for 75% conversion of 'A' is __________ minutes.
273. Decomposition rate of a liquid 'X' which decomposes as per the reaction is given by
274. With increase in the space time of an irreversible isothermal reaction being carried out in a P.F. reactor, the conversion will