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Affiliated te SE, New Delhi. Code, , , , CLASS IX IIT/NEET CHEMISTRY, WEEKLY TEST (12/12/21), TOPIC : CHEMICAL KINETICS marks:10, , 1, The role of a catalyst is to change, a) Gibbs energy of reaction, b) Enthalpy of reaction, c) Activation energy of reaction, d) Equilibrium constant, 2. Which of the following statements is correct ?, a) The rate of a reaction decreases with passage of time as the, concentration of reactants decrease, b) The rate of a reaction is same at any time during the reaction, c) The rate of a reaction is independent of temperature changes, d) The rate of reaction decreases with increases in concentration of, reactants, , 3.Which of the following statements is incorrect about the collision theory of, chemical reaction ?, , a) It considers reacting molecules or atoms to be hard spheres and, ignores their structural features., b) Number of effective collisions determines the rae of reaction., , c) Collision of atoms or molecules possessing sufficient threshold energy

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results into the product formation., d) Molecules should colloide with sufficient threshold energy amd proper, orientation for the collision to be effective., , 4. Consider the reaction A-->B. The concentration of both the reactants and, the products varies exponentially with time. Which of the following figures, correctly describes the change in concentration of reactants and products with, time ?, , (B), , S, Concentration —»>, , , , , , , , 5. The rate of reaction depends upon, , a) Molar concentration, b) Atomic mass, c) Equivalent mass, d) Noe of these, 6. Which of the following is incorrect about order of reaction ?, a) It is calculated experimentally, b) It is sum of powers of concentration in rate law expression, c) The order of reaction cannot be fractional, , d) There is not necessarily a connection between order and

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stoichiometry of a reaction, 7. The rate constant of a reaction depends on :, a) Extent of reaction, b) Time of reaction, c) Temperature, , d) Initial concentration of the reactants, , 8. For the reaction H2 + Cl2->2HCI taking place on water, the order of, reaction is:, , a) 0 bl cj2 dj3, , 9. Which one of the following equations is correct for the reaction, , N2 + 3H2-> 2 NH3, , , , Sa 2 at, 1 d{NH,J _ 1 d(H], a ae, 1d[{NH,]_ 1 d{H,], , (c) 2 dt 3 dt, , d{NH,] 1 d{H,, (d) 1 d[NI J - l Hs], 3. dt —2 dt

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10, For a reaction 1/2A> 2B, rate of disappearance of A is related to the rate of, appearance of B by the expression:, , d[A) | d[B) d[A d, (@)- "a = 2 ak (b) - SIN = 1 S81, a[A}_ d[B d[A d[B], Oa ee (d) “fins dt