6. If a reaction of the form aAlg) products is zero order, which of the followin

Question

6. If a reaction of the form aAlg) products is zero order, which of the following is true? a) The half life is independent of the initial concentration of substance A b) A plot of [Ajt on the Y-axis against t on the X-axis gives a straight line with a positive slope c) The rate of reaction is constant-it does not vary with the concentration of substance A d) The larger the initial concentration of substance A, the shorter the half life e) A plot of In [Alt on the Y-axis against t on the X-axis gives a straight line with a negative slope 7. If a reaction of the form aA(g) products is first order, which of the following is true? a) A plot of IAjt on the Y-axis against t on the X-axis gives a straight line with a positive slope b) A plot of IAjt on the Y-axis against t on the X-axis gives a straight line with a negative slope c) A plot of In [Alt on the Y-axis against t on the X-axis gives a straight line with a positive slope d) A plot of In [Ajt on the Y-axis against t on the X-axis gives a straight line with a negative slope e) A plot of 1/1Ajt on the Y-axis against t on the X-axis gives a straight line with a positive slope 8. If a reaction of the form aA(g) products is first order, which of the following is true? a) The rate of reaction is constant- it does not vary with the concentration of substance A b) The half life is independent of the initial concentration of substance A c) Both of the above statements are true for first order reactions d) None of the above is true for first order reactions 9. For a given first order process, the half-life is 15 seconds. Starting with a 1.0 M solution, how much is left after 1.5 min? a. >1.0 M b. 0.50 M c. 0.063 M d. 0.031 M e.

Explanation / Answer

6) zero order reaction is independnt of reactant concentration hence the rate = rate constant.. and answer is C

7) reaction is depend on concentration rate will decrease as time progress since concentration of reactant is decreasing by time. in the case of first order reaction decrease of concentration is exponential. the plot of ln A vs time will be a staright line with negative slope hence answer is D

8) since the rate of the reaction is varies as a first power of the intial concnetration of reactant half life of the first order reaction is a constant or in other words half life is indepent of concentration hence answer is B

9) for first order reaction cncentration will became half at each half life hence if inital conc. is 1 M after 15 sec it will be 0.5 M after another 15 sec or total 30 sec it will be 0.25 m and after 45 sec it will be 0.125 M after 60 sec or one minute it will be 0.0625 M after 75 sec it will be 0.03125 M and after 90 sec or 1.5 minute it will be 0.0156 M hence answer will be E

same you can calculate use the formulae log A0 - log A = kt/2.303 in which t = 90 sec; A0 = 1 M and A is your answer.. and k can be calculated using equation k = 0.693/ t1/2 where t1/2 is half life here it is 15 sec

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