CHEMICAL ENGINEERING, MEHRAN UET,JAMSHORO. Ikram zardari (13CH16)1. The rate of reaction Ans :Decreases 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 in no: of effective collision3. 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/dm^3sec6. The rate of reaction b/w two specific time interval is called Ans : average rate7. At the beginning,the decrease in concentration of reactants is Ans : Rapid8. 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. When the rate of reaction is entirely independent of the concentration of reactants molecule then order of reaction is Ans : Zero13. Diamond formation from carbon has order Ans : 3rd 14. In zero order reaction,the rate is independent of Ans : Concentration of reactants15. The excess energy of reactants required to dissociate into product is known as Ans : Activation energy16. Activation energy speeds up the rate of reaction Ans : false17. The rate at which a chemical substance reacts is directly proportional to its Ans : Active mass18. For the reaction H2+CL2-2HCLthe order of reaction is Ans : Zero19. 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 : -220. 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 times21. The time taken for 10 % completion of a first order is 20 minutes then for 19 % completion, the reaction will take Ans : 40 minutes22. The time needed for the concentration of reactant to drop to one-half the original value Ans : Half life of reaction23. An imbalanced equation is against the Ans : law of mass action24. A chemical reaction occurs spontaneously at constant temperature & pressure ,if the free energy is Ans : -ve25. The reaction in which rate equation corresponds to a stoichiometric equation is called Ans : elementary reaction 26. Equilibrium of ma chemical reaction as viewed by kinetic is Ans : dynamic (steady state)27. For a zero order reaction,concentration of product increases with Ans : rate of reaction time increases.28. Arrhenius equation shows the variation of ..,with temperature. Ans : Rate constant29. Chemical kinetics can predict the Ans : rate of reaction 30. With the increase in temperature, the rate constant obeying Arrhenius equation Ans : increases31. According to Arrhenius equation of temperature dependency of rate constant for an elementary reaction is Ans :k directly proportionality to e^E/RT.32. A reaction which is catalyzed by a base is catalyzed by all substances which have tendency to Ans : Gain of proton33. The rate of reaction does not decrease appreciably as the reaction proceeds in case of .reactions. Ans : Autocatalyst.34. Space time equals the mean residence time Ans : When the density of the reaction mixture is constant.35. 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 as36. A Limiting reactant which Ans : consumes first37. Inversion of sugar-cane is an example of Ans : Bio-molecular reaction with first order38. Differential method for analyzing the kinetic data is used Ans : For testing complicated mechanism39. Integral method for analyzing the kinetic is used Ans :When the data is scattered & for testing the specific mechanisms with simple rate expression.40. A catalyst promoter Ans : Improves the activity of catalyst41. 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 : 142. The study of kinetics is the easiest in the case of Ans : Irreversible reactions 43. If delta G (free energy change) for a chemical reaction is very large & negative,then the reaction is Ans :Very much feasible.44. Photochemical reaction rate does not depend significantly on temperature because Ans :The energy of reacting molecules exceeds the activation energy by absorption of light.45. In an exothermic reaction ,the energy of reacting substances as compared to that of production is Ans : More.