Chemical Kinetics PYQs Set 11 (PDF)

Set 11 of 11 · Questions 301-311 of 311

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Mere Teacher · Previous Year Questions JEE Main Chemistry · Chemical Kinetics · Set 11 (Q301-311)
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301. $The value of rate constant of pseudo first order reaction$ (1) $depends only on temperature$ (2) $depends on the concentration of reactants present in small amounts$ (3) $depends on the concentration of reactants present in excess$ (4) $is independent of the concentration of reactants.$ 302. $Which one of the following statements is correct?$ (1) $In collision theory, corresponds to the fraction of molecules that have energy equal or greater than .$ (2) $The number of collisions of reacting molecules per second per unit volume of the reaction mixture is activated complex.$ (3) $Molecularity is the number of molecules involved in a complex reaction.$ (4) $A catalyst catalyses the non-spontaneous reaction.$ 303. $For the reaction H^{+} + B r O_{3}^{-} + 3 B r^{-} \to 5 B r_{2} + H_{2} O which of the following relation correctly represents the consumption and formation of products.$ (1) $\frac{d [ B r ^{-} ]}{d t} = - \frac{3 d [ B r _{2} ]}{5 d t}$ (2) $\frac{d [ B r ^{-} ]}{d t} = \frac{3 d [ B r _{2} ]}{5 d t}$ (3) $\frac{d [ B r ^{-} ]}{d t} = - \frac{5 d [ B r _{2} ]}{3 d t}$ (4) $\frac{d [ B r ^{-} ]}{d t} = \frac{5 d [ B r _{2} ]}{3 d t}$ 304. $For a reaction between A and B the order with respect to A is 2 and the other with respect to B is 3. The concentrations of both A and B are doubled, the rate will increase by a factor of$ (1) $12$ (2) $16$ (3) $32$ (4) $10$ 305. $3 A \to 2 B, rate of reaction \frac{+ d _{[} B _{]}}{d t} is equal to$ (1) $- \frac{3 d [ A ]}{2 d t}$ (2) $- \frac{2 d [ A ]}{3 d t}$ (3) $- \frac{1 d _{[} A _{]}}{3 d t}$ (4) $+ 2 \frac{d [ A ]}{d t}$ 306. $Which is a wrong statement?$ (1) $Rate constant, k = Arrhenius constant A : if E_{a} = 0$ (2) $e-/RT gives the fraction of reactant molecules that are activated at the given temperature.$ (3) $ln kvs \frac{1}{T} plot is a straight line.$ (4) $presence of catalyst will not alter the value of E_{a} .$ 307. $A radioactive element has a half life of 200 days. The percentage of original activity remaining after 83 days is______. (Nearest integer) (Given : antilog 0.125 = 1.333, antilog 0.693 = 4.93)$ 308. $At 345 K, the half life for the decomposition of a sample of a gaseous compound initially at 55.5 kPa was 340 s. When the pressure was 27.8 kPa, the half life was fund to be 170 s. The order of the reaction is________. [integer answer]$ 309. $For a reaction A \to 2B + C the half lives arc 100 s and 50 s when the concentration of reactant A is 0.5 and 1.0 mol L^{- 1} respectively. The order of the reaction is________. (Nearest Integer)$ 310. $Catalyst A reduces the activation energy for a reaction by 10 kJ m o l^{- 1} at 300 K. The ratio of rate constants is e^{x} . The value of x is _______. [nearest integer] [Assume theat the pre-exponential factor is same in both the cases. Given R= 8.3 J K^{- 1} m o l^{- 1}]$ 311. $For the decomposition of azomethane. C H_{3} N_{2} C H_{3} (g) \to C H_{3} C H_{3} (g)+ N_{2} (g) a first order reaction, the variation in partial pressure with time at 600 K is given as The half life of the reaction is_____ x 10+^{5} s.[Nearest integer]$