Chapter 8.docx

CHAPTER 8

CHEMICAL KINETICS

BY: SHAHID KAKA

1. The rate of reaction a) Increases as the reaction proceeds b) Decreases as the reaction proceeds c) Remains the same as the reaction proceeds d) N.O.T 2. The addition of a catalyst to the reaction system a) Increases the rate of forward reaction only b) Increases the rate of reverse reaction c) Increases the rate of forward but decreases the rate of backward reaction d) Increases the rate of forward as well as backward reaction equally 3. The value of activation energy is primarily determined by a) Temperature b) Effective collision c) Concentration of reactants d) Chemical nature of reactants and products 4. Sum of exponents of molar concentration is called a) Order of reaction b) Molecularity c) Rate of reaction d) Activation Energy 5. In rate expression the concentration of reactants is negative. It shows a) Concentration of reactant does not change b) Concentration of product increases c) Concentration of reactant decreases d) Concentration of reactant increases 6. Unit of rate of reaction is a) Moles dm-3 sec-1 b) Moles dm-3 c) Moles sec-1 d) Mol-1 dm3 sec-1 7. Greater the conc. Of reactant a) Greater will be dx/dt b) Lesser will be dx/dt c) dx/dt will be moderate d) A.O.T 8. Each catalyst has a) Specificity b) Special structure c) Its own EA d) A.O.T 9. A catalyst cannot effect a) Products b) Chemical equilibrium c) Reactants d) both a & b 10. Anything which increases rate of reaction without being involved in the reaction a) Promoter b) Catalyst c) Inhibitor d) A.O.T 11. Which of the following do not effect on rate of reaction a) Temperature b) Concentration c) Pressure d) Radiation 12. _________ reactions are independent of concentration a) 1st b) 2nd rd c) 3 d) zero 13. 3O2  2O3 is ___________ the order reaction? a) 1st b) 2nd rd c) 3 d) zero 14. Rate of reaction when concentration of reactants are taken as unity is called a) Rate constant b) Rate expression c) Specific Rate constant d) N.O.T 15. By decreasing surface area rate of reaction a) Increases b) decreases c) Remains same d) N.O.T

CHAPTER 8

CHEMICAL KINETICS

BY: SHAHID KAKA

ANSWER KEY 01

B

02

D

03

B

04

A

05

C

06

A

07

A

08

D

09

D

10

B

11

C

12

D

13

C

14

C

15

B

1. The mixing of atomic orbital to produce to produce the same no of equivalent obitals having same shape and same energy is called a) Combination b) disintegration c) Hybridization d)Co ordination 2. The _________ change in chemical reaction is due to bond being formed or broken down? a) Atomic b) Molecular c) Energy d) A.O.T 3. Bond energy is the measure of strength of __________? a) Atoms b) molecules c) Bonds d) ions 4. Lewis concept of electron pair of covalent bond failed to explain a) Geometry b) Magnetic properties c) Size d) Both a and b 5. In 1927 ____________ and ____________extended the Lewis concept a) Heitler, London b) Thomson, Rutherford c) Faraday, Bohr d) N.O.T 6. Hunds , Hackle and Mulliken proposed a theory known as a) VBT b) MOT

CHAPTER 8

CHEMICAL KINETICS

BY: SHAHID KAKA

c) Both a and b d) N.O.T The place where probability of finding electrons is zero is called a) Nodal plane b) Anti Nodal Plane c) Both a and b d) N.O.T 8. SP3 hybridization occurs in the __________ compounds of carbon in which the carbon is attached with 3 other four atoms. a) Unsaturated b) saturated c) Alkynes d) Alkenes 9. The maximum p character possessed by ___________ hybridization? a) Sp3 b) Sp2 c) Sp d) A.O.T 10. In Sp2 hybridization the un hybridized orbital remains at an angle of __________ to the plane a) 600 b) 900 0 c) 120 d) 1800 11. If the central atom is attached with 3 bond pairs the hybridization will be a) Sp3 b) Sp2 c) Sp d) A.O.T 12. Lone pair of electron is also known as a) Free set of electrons b) Active set of electrons c) Non active set of electrons d) both a and b 13. Sedgwick and Powell proposed _________ theory? a) VSEPR b) Hybrid orbital c) VBT d) MOT 14. In central atom is sp3 hybridized with 2 lone pair of electrons the bond angle will be a) 109.28 b) 107 c) 104.5 d) 90 15. The shape of ammonia is a) Linear b) Bent c) Pyramidal d) Trigonal 7.