CHEMICAL ENGINEERING, MEHRAN UET,JAMSHORO. Ikram zardari (13CH16)1. The rate of reaction Ans :Decreases the concentration of the reactants as the reaction proceeds.2. With increase of 10C temperature,the rate of reaction doubles.This increases in the rate of reaction is due to Ans :Increase the no: of effective collision of the particles3. The unit of rate constants is the same as that of the rate of reaction inAns : Zero order reaction.4. Which order of reaction completes firstAns : Zero order reaction5. The unit of reaction is Ans : moles/dm3sec6. The rate of reaction b/w two specific time interval is called Ans : average rate 7. At the beginning,the decrease in concentration of reactants is Ans : Rapid in the concentration of the reactants.8. The substance which alters the rate of reaction called Ans : catalyst9. In human body,the catalysts are Ans : Enzymes10. The decomposition of ozone (O3) has order Ans : (-ve)11. The experimental relationship b/w a reaction rate & the concentration of reactants called Ans : specific rate12. What is zero order reaction ? 13. Ans : The rate at which reaction is entirely independent of the concentration of reactants molecule. 14. 15. Diamond formation from carbon has order Ans : 3rd due to the high activation energy as well as the time requirement high.16. In zero order reaction,the rate is independent of Ans : Concentration present in the reactant profile.17. The excess energy of reactants required to dissociate into product is known as Ans : The energy that is not responsible to take part in the reaction (Activation energy).18. Does activation energy speeds up the rate of reaction ?Ans : Activation energy does not speed up the reaction but it retards the rate of the reaction.19. The rate at which a chemical substance reacts is directly proportional to its Ans : Active mass present in the reactant or the reaction gradient.20. For the reaction H2+CL2-2HCLthe order of reaction is Ans : Zero21. The rate of reation b/w two reactants A & B decreases by a factor of 4 if the concentration of reactant B is doubled.The order in reaction w-r-t reactant B is Ans : -222. In a zero order reaction for every 10C rise of temperature ,the rate is doubled.If the temperature is increased from 10C to 100C,the rate of reaction will become Ans :512 times23. The time taken for 10 % completion of a first order is 20 minutes then for 19 % completion, the reaction will take Ans : 40 minutes24. What is half life of reaction ? Ans : The time needed for the concentration of reactant to drop to one-half the original value 25. An imbalanced equation is against the Ans : law of mass action which states that mass entered in the reactant is equal to the mass exist at the product.26. A chemical reaction occurs spontaneously at constant temperature & pressure ,if the free energy is Ans : -ve27. The reaction in which rate equation corresponds to a stoichiometric equation is called Ans : elementary reaction 28. Equilibrium of chemical reaction as viewed by kinetic is Ans : dynamic (steady state) at which the reactant & the product is same.29. For a zero order reaction,concentration of product increases with Ans : rate of reaction time increases & the concentration of reactant decreases.30. Arrhenius equation shows the variation of ..,with temperature. Ans : Rate constant (k)31. Chemical kinetics can predict the Ans : rate of reaction and what time requires to complete the reaction.32. With the increase in temperature, the rate constant obeying Arrhenius equation Ans : increases due to the particles movement & the gradient increase in the product & the reactant.33. According to Arrhenius equation of temperature dependency of rate constant for an elementary reaction is Ans :k directly proportionality to eE/RT.34. A reaction which is catalyzed by a base is catalyzed by all substances which have tendency to Ans : Gain of proton or the attraction to gain the proton in the reaction.35. The rate of reaction does not decrease appreciably as the reaction proceeds in case of .reactions. Ans : Autocatalyst.36. Space time equals the mean residence time Ans : When the density of the reaction mixture is kept constant.37. In a first order reaction ,the time required to reduce the concentration of reactant from 1 mol/litre to 0.5 mol/litre will be..that required to reduce it from 10 mol/litre to 5 mol/litre in the same volume Ans : same as because of the time interval according to the concentration gradient.38. A Limiting reactant which Ans : consumes first but could not take place without the limiting reactant.39. Inversion of sugar-cane is an example ofAns : Bio-molecular reaction with first order reaction to reduce the size of the sugar cane.40. Differential method for analyzing the kinetic data is used Ans : For testing complicated mechanism in the reaction while in the reactant & the product.41. Integral method for analyzing the kinetic is used Ans :When the data is scattered & for testing the specific mechanisms with simple rate expression.42. A catalyst promoter Ans : Improves the activity of catalyst43. A reaction A3B is conducted in a constant pressure vessel.Starting with pure A,the volume of reaction mixture increases 3 times in 6 minutes.The fractional conversion is Ans : 144. The study of kinetics is the easiest in the case of Ans : Irreversible reactions 45. If delta G (free energy change) for a chemical reaction is very large & negative,then the reaction is Ans :Very much feasible.46. Photochemical reaction rate does not depend significantly on temperature because Ans :The energy of reacting molecules exceeds the activation energy by absorption of light.47. In an exothermic reaction ,the energy of reacting substances as compared to that of production is Ans : More.