Chemical Kinetics PYQs Set 8 (PDF)

Set 8 of 8 · Questions 211-224 of 224

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NEET Chemistry · Chemical Kinetics · Set 8 (Q211-224)

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211.
For a given reaction $R \to P, t_{1/2}$ is related to $[A]_{0}$ as given in table. Given: $log 2 = 0.30$ Which of the following is true? A. The order of the reaction is $1/2$ . B. If $[A]_{0}$ is 1 M , then $t_{1/2}$ is $20010 min C$ . The order of the reaction changes to 1 if the concentration of reactant changes from 0.100 M to 0.500 M. D. $t_{1/2}$ is 800 min for $[A]_{0} = 1.6 M$ Choose the correct answer from the options given below: Options
1. (1) $A and C Only$
2. (2) $A, B and D Only$
3. (3) $C and D Only$
4. (4) $A and B Only$
212.
Identify the intermediate in the following sequence of reaction. $2 SO_{2} + 2 NO_{2} \to 2 SO_{3} + 2 NO 2 NO + O_{2} \to 2 NO_{2}$
1. (1) $SO_{2}$
2. (2) $SO_{3}$
3. (3) $NO_{2}$
4. (4) $NO$
213.
When a biochemical reaction is carried out in laboratory, outside the human body in absence of enzyme, then rate of reaction obtained is $1 0^{- 6}$ times, the activation energy of reaction in the presence of enzyme is
1. (1) $6/ R T$
2. (2) $P is required$
3. (3) $different from E_{a} obtained in laboratory$
4. (4) $can’t say anything.$
214.
For the reaction, $2 A + B \to 3 C + D$ , which ofthe following does not express the reaction rate?
1. (1) $- \frac{d [ A ]}{2 d t}$
2. (2) $- \frac{d [ C ]}{3 d t}$
3. (3) $-$
4. (4) $\frac{d [ D ]}{d t}$
215.
In a zero‐order reaction, for every $1 0^{0} C$ rise of temperature, the rate is doubled. If the temperature is increased from $1 0^{0} C$ to $10 0^{o} C,$ the rate of the reaction will become
1. (1) $256 times$
2. (2) $512 times$
3. (3) $64 times$
4. (4) $128 times$
216.
A reaction is 50% complete in 2 hours and 75% complete in 4 hours. The order of reaction is
1. (1) $1$
2. (2) $2$
3. (3) $3$
4. (4) $0$
217.
$A student has studied the decomposition of a gas A B_{3} at 25°C. He obtained the following data.$
$p(mm Hg)$ $50$ $100$ $200$ $400$
$Relative t_{1/2} (s)$ $4$ $2$ $1$ $0.5$
$The order of the reaction is$
1. (1) $0.5$
2. (2) $2$
3. (3) $1$
4. (4) $0$
218.
The reaction takes place in two steps as
(i) $NO_{2} Cl_{(g)} \to K_{1} NO_{2 (g)} + Cl_{(g)}$
(ii) $NO_{2} Cl_{(g)} + Cl_{(g)} \to K_{2} NO_{2 (g)} + Cl_{(g)}$
Identify the reaction intermediate.
1. (1) $NO_{2} Cl_{(g)}$
2. (2) $Cl_{2 (g)}$
3. (3) $NO_{2 (g)}$
4. (4) $Cl_{(g)}$
219.
The value of rate constant of pseudo first order reaction
1. (1) $depends only on temperature$
2. (2) $depends on the concentration of reactants present in small amounts$
3. (3) $depends on the concentration of reactants present in excess$
4. (4) $is independent of the concentration of reactants.$
220.
Which one of the following statements is correct?
1. (1) $In collision theory, corresponds to the fraction of molecules that have energy equal or greater than .$
2. (2) $The number of collisions of reacting molecules per second per unit volume of the reaction mixture is activated complex.$
3. (3) $Molecularity is the number of molecules involved in a complex reaction.$
4. (4) $A catalyst catalyses the non-spontaneous reaction.$
221.
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. (1) $\frac{d [ B r ^{-} ]}{d t} = - \frac{3 d [ B r _{2} ]}{5 d t}$
2. (2) $\frac{d [ B r ^{-} ]}{d t} = \frac{3 d [ B r _{2} ]}{5 d t}$
3. (3) $\frac{d [ B r ^{-} ]}{d t} = - \frac{5 d [ B r _{2} ]}{3 d t}$
4. (4) $\frac{d [ B r ^{-} ]}{d t} = \frac{5 d [ B r _{2} ]}{3 d t}$
222.
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. (1) $12$
2. (2) $16$
3. (3) $32$
4. (4) $10$
223.
$3 A \to 2 B$ , rate of reaction $\frac{+ d _{[} B _{]}}{d t}$ is equal to
1. (1) $- \frac{3 d [ A ]}{2 d t}$
2. (2) $- \frac{2 d [ A ]}{3 d t}$
3. (3) $- \frac{1 d _{[} A _{]}}{3 d t}$
4. (4) $+ 2 \frac{d [ A ]}{d t}$
224.
Which is a wrong statement?
1. (1) $Rate constant, k = Arrhenius constant A : if E_{a} = 0$
2. (2) $e-/RT gives the fraction of reactant molecules that are activated at the given temperature.$
3. (3) $ln kvs \frac{1}{T} plot is a straight line.$
4. (4) $presence of catalyst will not alter the value of E_{a} .$