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Chemical Kinetics

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MHT-CET QUESTIONS -3 -1 1. mol.dm sec is the unit of (i) Rate (ii) rate constant (iii) order (iv) active mass 2. The elementary step with slow rate represents (i) Rate determining step (ii) maximum rate step (iii) Third order rate (iv) overall order 3. Molecularity is determined for (i) an elementary reaction (ii) an overall reaction (iii) an overall stoichiometric reaction (iv) a fractional order reaction 4. Hydrolysis of an ester by dilute HCl is an example for (a) Second order reaction (b) zero order reaction (c) Pseudo first order reaction (d) first order reaction 5. The unit of zero order rate constant is (a) Liter mol 1 sec 1 (b) mol litre 1 sec 1 (c) sec 1 (d) litre2 sec 1 6. The excess energy which a molecule must possess to become active is known as (a) Kinetic energy (b) threshold energy (c) Potential energy (d) activation energy 7. The sum of the powers of the concentration terms that occur in the rate equation is called (a) Molecularity (b) order (c) rate (d) rate constant 8. The half life period of a first order reaction is 10 minutes. Then its rate constant is (a) 6.93 102 min 1 (b) 0.693 10 2 min 1 (c) 6.932 10 2 min 1 (d) 69.3 10 1 min 1 9. The rate of a reaction is expressed in different ways as follows The reaction is: (a) 4 A + B 2C + 3D (b) B + 3D >4A + 2C (c) A + B C + D (d) B + D >A + C 10. Which of the following statement is incorrect about order of reaction? [JEE 2005] (a) Order of reaction is determined experimentally (b) It is the sum of power of concentration terms in the rate law expression (c) It does not necessarily depend on stoichiometric coefficients (d) Order of the reaction cannot have fractional value. 11. The order & Molecularity are a) Different b) same c) independent d) none 12. Rate of reaction is depends upon a) Temperature b) concentration of reactant c) Concentration of product d) both a & b 13. Reactive decay follows . Kinetics a) 0 b) 1st c) 2nd d) 3rd 14. Chemical kinetics deals with a) Structure of molecule b) Rate of reaction c) Physical changes in reaction d) all 15. Half life period is a) Time required of complete reaction b) T ime required to form product c) Time required to decrease initial concentration to half. d) None 16. Order of reaction is determined by a) Experiment b) Chemical equation c) Rate constant d) none 17. Half life of reaction is found to be independent of initial concentration the reaction is of .. order. a) 0 b) 1st c) 2nd d) 3rd 18. Hydrolysis of ester is . Order reaction a) Pseudo 1st b) 1st c) 2nd d) 3rd 19. SN2 reaction is . order. a) 0 b) 1st c) 2nd d) 3rd 20. 10o rise in temperature a) Doesn t affect rate by much b) increases rate by 2 to 3 times c) Both d) None

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