{"id":21442,"date":"2022-01-17T17:40:50","date_gmt":"2022-01-17T12:10:50","guid":{"rendered":"https:\/\/infinitylearn.com\/surge\/?p=21442"},"modified":"2022-02-08T17:50:49","modified_gmt":"2022-02-08T12:20:49","slug":"chemical-kinetics-viva-questions-with-answers","status":"publish","type":"post","link":"https:\/\/infinitylearn.com\/surge\/study-materials\/chemical-kinetics\/viva-questions-with-answers\/","title":{"rendered":"Chemical Kinetics Viva Questions with Answers"},"content":{"rendered":"

Question.1. What is chemical kinetics ?<\/strong>
\nAnswer.<\/strong> Chemical kinetics is that branch of chemistry which deals with the study of the rates of reactions and their mechanisms.<\/p>\n

Question.2. What do you understand by the rate of reaction ?<\/strong>
\nAnswer.<\/strong> The rate of a reaction is defined as the change in the molar concentration of any one of the reactant or the product per unit time.<\/p>\n

Question.3. What are the units of the rate of reaction ?<\/strong>
\nAnswer.<\/strong> Mol L-1<\/sup> s-1<\/sup> (Moles per litre per second).<\/p>\n

Question.4. What are the factors on which the rate of reaction depends ?<\/strong>
\nAnswer.<\/strong> The rate of reaction depends upon : (i) Nature of the reactants ; (ii) Concentration of the reactants ; (iii) Temperature ; (iv) Presence of catalyst; and (v) Presence of radiations.<\/p>\n

Question.5. What is the law of mass action ?<\/strong>
\nAnswer.<\/strong> Law of mass action states that the rate of a reaction is directly proportioned to the product of molar concentrations of the reactants.<\/p>\n

Question.6. What is temperature coefficient of a reaction ?<\/strong>
\nAnswer.<\/strong> Temperature coefficient of a reaction is the ratio of rate constants at two temperatures differing by 10\u00b0. Its value is generally equal to 2.<\/p>\n

Question.7. What are the units of rate constant for zero order reactions ?<\/strong>
\nAnswer.<\/strong> Same as rate of the reaction, i.e. moles\/litre\/sec.<\/p>\n

Question.8. What are the units of rate constant for first order reactions ?<\/strong>
\nAnswer.<\/strong> Sec-1<\/sup>.<\/p>\n

Question.9. What is the effect of temperature on rate constant of a reaction ?<\/strong>
\nAnswer.<\/strong> It increases with increase in temperature.<\/p>\n

Question.10. Why certain reactions are very fast ?<\/strong>
\nAnswer.<\/strong> Because they have very low activation energy.<\/p>\n

Question.11. What is threshold energy ?<\/strong>
\nAnswer.<\/strong> It is the minimum energy which the colliding molecules must possess so as to have effective collision.<\/p>\n

Question.12. Why reactions with molecularity more than three are rare ?<\/strong>
\nAnswer.<\/strong> Because simultaneous collision between more than three particles is rare on the basis of probability considerations.<\/p>\n

Question.13. \u201cFor an exothermic reaction activation energy for the forward reaction is less than that for the backward reaction.\u201d Is this statement true or false ?<\/strong>
\nAnswer.<\/strong> True.<\/p>\n

Question.14. What is rate determining step ?<\/strong>
\nAnswer.<\/strong> In complex reactions, the slowest step determines the over all rate of the reaction. This step is known as rate determining step.<\/p>\n

Question.15. What is the effect of catalyst on the activation energy and heat of the reaction ?<\/strong>
\nAnswer.<\/strong> A catalyst decreases the activation energy of the reaction. It has no effect on the heat of the reaction.<\/p>\n

Question.16. On increasing the concentration of reactants the rate of the reaction does not change. What can you say about the order of the reaction ?<\/strong>
\nAnswer.<\/strong> It is a zero order reaction.<\/p>\n

Question.17. Can order of a reaction be fractional ?<\/strong>
\nAnswer.<\/strong> Yes. For example, for the reaction
\nCH3<\/sub>CHO \u2014\u2014> CH4 <\/sub> + CO
\nthe order is equal to 3\/2.<\/p>\n

Question.18. What is a complex reaction ?<\/strong>
\nAnswer.<\/strong> A reaction involving more than one step is called a complex reaction.<\/p>\n

Question.19. What do you understand by \u20184 volume\u2019 H2<\/sub>O2 <\/sub> solution ?<\/strong>
\nAnswer.<\/strong> It is a way of expressing the cone, of H202 solution. 1 litre of \u20184 volume\u2019 H2<\/sub>O2 <\/sub> solution gives 4 litres of oxygen at N.T.P. on decomposition.<\/p>\n

Question.20. Express the cone, of 1 M H2<\/sub>O2 <\/sub> solution in terms of volume strength.<\/strong>
\nAnswer.<\/strong> 2H2<\/sub>O2 <\/sub>\u2014\u2014> 2H2<\/sub>0 + O2<\/sub>
\n2 mol 22.4 L
\n1 litre of 1 M H2<\/sub>O2 <\/sub> contains 1 mole of H2<\/sub>O2 <\/sub> and hence would give 11.2 L on complete decomposition. Hence, 1 M H2<\/sub>O2 <\/sub> solution is \u201811.2 volume\u2019.<\/p>\n

Question.21. What is the equivalent mass of H2<\/sub>O2<\/sub> ?<\/strong>
\nAnswer.<\/strong> 17.<\/p>\n

Question.22. What is the normality of 1 M H2<\/sub>O2<\/sub> solution ?<\/strong>
\nAnswer.<\/strong> 2 N.<\/p>\n

Question.23. What is the oxidation number of oxygen in H2<\/sub>O2<\/sub> ?<\/strong>
\nAnswer.<\/strong> -1.<\/p>\n

Question.24. What is the colour of starch-iodine complex ?<\/strong>
\nAnswer<\/strong>. Blue.<\/p>\n

Question.25. What is the effect of increase in cone, of iodide ions on the following reaction : <\/strong>2H3<\/sub>0+ + 2I\u2013<\/sup> +H2<\/sub>O2 <\/sub> \u2014\u2013> 4H2<\/sub>0 + I2<\/sub><\/strong>
\nAnswer.<\/strong> Rate of the reaction increases.<\/p>\n

Question.26. The reaction under examination is as follows :<\/strong>
\nS2<\/sub>O3<\/sub>2-<\/sup> (aq) + 2H+<\/sup>(aq) \u2014-> H2<\/sub>O(l) + SO2<\/sub>(g) + S(g)<\/strong>
\nWrite the conditions under which the rate law expression for this reaction can be written in the following manner.<\/strong>
\nRate of precipitation of sulphur = k [S2<\/sub>O3<\/sub>2-<\/sup>] [H+<\/sup>]2<\/sup>.<\/strong>
\nAnswer.<\/strong> None of the reactants should be used in excess and the reaction should be elementary.<\/p>\n

Question.27. Suppose the above rate law expression for the precipitation of sulphur holds good, then on doubling the concentration of S2<\/sub>O3<\/sub>2-<\/sup> ion and H+ ion, by how many times will the rate of the reaction increase ?<\/strong>
\nAnswer.<\/strong> By eight times.<\/p>\n

Question.28. How does the rate constant of a reaction vary with temperature ?<\/strong>
\nAnswer.<\/strong> The rate constant of a reaction increases with increase in temperature.<\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

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