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Chemical Reaction Quiz 6


Chemical Reaction Quiz 6

1 / 50

Space time equals the mean residence time___________?

2 / 50

Rate constant for a first order reaction does not depend upon reaction time, extent of reaction and the initial concentration of reactants; but it is a function of reaction temperature. In a chemical reaction, the time required to reduce the concentration of reactant from 100 gm moles/litre to 50 gm moles/litre is same as that required to reduce it from 2 gm moles/litre to 1 gm mole/litre in the same volume. Then the order of this reaction is ?

3 / 50

The catalytic activity of enzymes is due to their capacity to lower the _______ energy?

4 / 50

Pick out the wrong statement?

5 / 50

Signal normally used to study non-ideal flow by stimulus response technique is ________ input?

6 / 50

Space velocity______?

7 / 50

Second order consecutive irreversible reaction as shown in the bellow figure, were carried out in a constant volume isothermal batch reactor with different initial feed compositions. Reactor temperature was same in all the cases. In experiments where the ratio of concentration of B to that of A in the initial feed was less than 0.5, the concentration of B increased first, reached a maximum and then declined with time. However, for all experiments where this concentration ratio was 0.5 or above, concentration of B decreased monotonically with time right from the beginning. What is the ratio of the two rate constants (k1/k2) ?

8 / 50

The dispersion number of perfect mixed flow is___________?

9 / 50

Radioactive decay follows _______ order kinetics?

10 / 50

Recycling back of outlet stream to the reactor from an ideal CSTR carrying out a first order liquid phase reaction will result in _______ in conversion?

11 / 50

Rate of a gaseous phase reaction is given by the reaction shown in the bellow figure. The unit of rate constant is___________?

12 / 50

Sometimes, batch process is preferred over continuous process, when the product_____?

13 / 50

Pick out the wrong statement?

14 / 50

The concentration of A in a first order reaction, A ? B, decreases_______?

15 / 50

Rate of a chemical reaction is not affected by the______?

16 / 50

Sulphuric acid is used as a catalyst in the________?

17 / 50

Space time in flow reactor is______?

18 / 50

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_________?

19 / 50

Reaction rate of a first order reaction, which is half completed in 23 minutes will be __________?

20 / 50

The effectiveness factor for large value of Thiele modulus [L?(K/D1)] of a solid catalysed first order reaction is equal to (where, L = length of the reactor, cm, D1 = diffusion co-efficient, cm2/second) ?

21 / 50

The catalyst in a first order chemical reaction changes the__________?

22 / 50

Shift conversion reaction__________?

23 / 50


24 / 50

Rate constant ?k? and absolute temperature ?T? are related by collision theory (for bimolecular) as________?

25 / 50

Specific rate constant for a second order reaction___________?

26 / 50

The ?E? curve for a non-ideal reactor defines the fraction of fluid having age between t and t + dt _______?

27 / 50

The catalytic converter for conversion of SO2 to SO3 by contact process should have a feed with SO2 content between_____?

28 / 50

Rate of a chemical reaction is independent of the concentration of the reactants for a __________ reaction?

29 / 50

Pick the WRONG design guideline for a reactor in which the reactions, A ? R (desired) and A ? S (undesired) are to take place. The ratio of the reaction rates is rR/rS = (k1/k2). CA a-b ?

30 / 50

Pick out the wrong statement?

31 / 50

Pick out the wrong statement?

32 / 50

The catalyst in a second order reversible reaction increases the rate of the forward reaction_____?

33 / 50

Reaction of benzene with chlorine gas to produce tri-chlorobenzene exemplifies a/an _______ reaction?

34 / 50

The eddy diffusivity for a liquid in plug flow must be__________?

35 / 50

Reactions with high activation energy are_______?

36 / 50

Rate of an autocatalytic chemical reaction is a function of _____?

37 / 50

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_______?

38 / 50

The conversion of a reactant, undergoing a first order reaction, at a time equal to three times the half life of the reaction is ?

39 / 50

Pick out the wrong statement?

40 / 50

Pick out the wrong statement?

41 / 50

Sum of the powers of the concentration terms in the rate equation is called the ______ of the reaction?

42 / 50

The conversion for a second order, irreversible reaction (constant volume) as shown in the bellow figure, in batch mode is given by_______?

43 / 50

The dimensions of rate constant for reaction 3A ? B are (l/gm mole)/min. Therefore the reaction order is________?

44 / 50

Promoter is added to the catalyst to improve its______?

45 / 50

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?

46 / 50

Reverse reaction in a chemical equilibrium is favoured by the_________?

47 / 50

Slurry reactors are characterised by the__________?

48 / 50

Rate of a chemical reaction is not influenced by the___________?

49 / 50

Rate determining step in a reaction consisting of a number of steps in series is the _______ step?

50 / 50

Semibatch reactor is preferred, when a/an___________?

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