Yakeen NEET 2.0 2025 (Alpha) Chemistry Practice Sheet PDF

NEET Yakeen NEET 2.0 2025 (Alpha) Practice Sheet Chemistry Chemical Kinetics Q1 The chemical reaction: 2A + B → C...

NEET Yakeen NEET 2.0 2025 (Alpha) Practice Sheet Chemistry Chemical Kinetics Q1 The chemical reaction: 2A + B → C + 2D is found of its original concentration. What is the rate to be first order with respect to A but second constant of this radioactive decay reaction? order which respect to B. The rate of the (A) 865.8 s-1 (B) 600 s-1 reaction is given by; (C) 415.8 s-1 (D) 0.001155 s-1 (A) k[A] [B]2 (B) k[A]2 [B] Q7 Which of the following is an incorrect (C) k[A] [B] (D) None of these representation of the order of a reaction? Q2 The unit of rate constant for a zero order (A) N2 O5 (g) → 2N2 (g) + 12 O2 (g) is a 1st reaction is; order reaction. (A) s-1 (B) mol dm-3 s-1 (B) 2 CH3 CHO → 2 CH4 + 2 CO is a 2nd (C) mol-1dm3 s-1 (D) mol-2dm6 s-1 order reaction. 2− (C) S2 O2− − 8 + 2I → 2 SO4 + I2 is a 3rd Q3 It takes 15 minutes for the concentration of a order reaction. radioactive species to decay to its 1/8th value (D) None of these of its original concentration. What is the rate constant of this radioactive decay reaction? Q8 Which of the following statement is not correct -1 -1 (A) 865.8 s (B) 0.001155 s for the reaction -1 -1 (C) 600 s (D) 0.00231 s 4A + B →2C + 2D (A) The rate of disappearance of B is one-fourth Q4 The pre-exponential factor 'A' in the Arrhenius the rate of disappearance of A equation depends on which of the following? (B) The rate of appearance of C is one-half the (A) Collision frequency rate of disappearance of B. (B) Gibb's free energy of reaction (C) The rate of formation of D is one-half the (C) Energy of activation of the reaction rate of consumption of A. (D) None of these (D) The rate of formation of C and D are equal. Q5 In collision theory of bimolecular gaseous Q9 The half life period for a first order reaction is reactions, the collision frequency does not 69.3 s. Its rate constant is; depend on; (A) 10-2 s-1 (B) 10-4 s-1 (A) pressure of the system (C) 10 s-1 (D) 102 s-1 (B) number of molecules of each gas (C) temperature of the system Q10 For a first order reaction involving (D) reduced mass of the system decomposition of N 2 O 5, the following information is available : Q6 It takes 20 minutes for the concentration of a radioactive species to decay to its 1/4th value Android App | iOS App | PW Website  NEET 2N2 O5 (g) → 4 NO2 (g) + O2 (g) Q13 If k1 and k2 are rate constants at temperatures Rate = k[N2 O5 ] T1 and T2 respectively, then according to Arrhenius equation, N2 O5 (g) → 2 NO2 (g) + 12 O2 (g) (A) log k2 = 2.303R ( 1 − 1 ) Rate = k'[N2 O5 ] k1 Ea T1 T2 = 2.303R ( T − T1 ) (B) log k 2 E a 1 Which of the following expressions is true? k 1 1 2 (A) k = k' (B) k' = 2k ( T11 − T12 ) (C) log k1 Ea k2 = 2.303R (C) k' = 1/2k (D) k > k' (D) log k1 k2 = Ea 2.303 ( T1 − T1 ) 1 2 Q11 Which of the following graphs correspond to first order reaction? Q14 When In k is plotted against 1/T, the slope was (A) found to be -10.7 × 103 K, activation energy for the reaction would be : −1 (A) −78. 9 kJ mol (B) 2. 26 kJ mol−1 (C) 88. 9 kJ mol−1 (D) 10. 7 kJ mol−1 (B) Q15 An exothermic reaction A → B has an activation energy of 17 kJ per mole of A. The heat of reaction is 40 kJ. The activation energy for the reverse reaction B → A is: (A) 23 kJ (B) 97 kJ (C) (C) 57 kJ (D) 17 kJ Q16 Which of the following statement is true? (A) The reaction is fast if the activation energy is low. (B) The activation energy of forward reaction (D) can never be greater than that of the backward reaction. (C) A catalyst increases the rate of a reaction by decreasing the rate of backward reaction. (D) Reaction rates increase with temperature Q12 On increasing temperature of the reacting because the activation energy decreases at system by 10o the rate of reaction almost high temperature. doubles. The most appropriate reason for this Q17 For the reaction is; 1 N2 O5 (g) → 2 NO2 (g) + O (g) 2 2 the value of (A) collision frequency increases rate of disappearance of N2O5 is given as 6.25 (B) activation energy decreases by increase in ×10-3 mol L-1 s-1. The rate of formation of NO2 temperature. and O2 is given respectively as : (C) the fraction of molecules having energy (A) 6. 25 × 10−3 mol L−1 s−1 and 3. 125 equal to threshold energy or more increases. × 10−3 mol L−1 s−1 (D) the value of threshold energy decreases. (B) Android App | iOS App | PW Website  NEET 6. 25 × 10−3 mol L−1 s−1 and 6. 25 (C) 1 × 10−1 mol L−1 s−1 × 10−3 mol L−1 s−1 (D) 6 × 10−4 mol L−1 s−1 (C) 6. 25 × 10−3 mol L−1 s−1 and 6. 125 × 10−3 mol L−1 s−1 Q22 The value of rate constant of pseudo first order (D) 1. 25 × 10−2 mol L−1 s−1 and 3. 125 reaction; × 10−3 mol L−1 s−1 (A) depends only on temperature. Q18 Consider the following statements : (B) depends on the concentration of reactants (i) Increase in concentration of reactant present in small amounts. increases the rate of a zero order reaction. (C) depends on the concentration of reactants (ii) Rate constant k is equal to collision present in excess. frequency A if Ea = 0. (D) is independent of the concentration of (iii) Rate constant k is equal to collision reactants. frequency A if Ea =∞. Q23 Which of the following statement is incorrect? (iv) In k vs T is a straight line. (A) Molecularity is only applicable for (v) In k vs 1/T is a straight line. elementary reaction. Correct statements are; (B) The rate law for any reaction cannot be (A) (i) and (iv) (B) (ii) and (v) determined experimentally. (C) (iii) and (iv) (D) (ii) and (iii) (C) Bimolecular reactions involve simultaneous Q19 For the elementary reaction M→ N, the rate of collision between two species. disappearance of M increases by a factor of 8 (D) Complex reactions have fractional order. upon doubling the concentration of M. The Q24 The temperature coefficient of a reaction is 2. order of the reaction with respect to M is; When the temperature is increased from 30°C (A) 4 (B) 3 to 90°C, the rate of reaction is increased by; (C) 2 (D) 1 (A) 150 times (B) 410 times Q20 The data given below are for the reaction of A (C) 72 times (D) 64 times and D2 to form product at 295 K. Find the Q25 Assertion (A) : Rate of reaction increases with correct rate expression for this reaction. increase in temperature. Initial Reason (R) : Number of collisions increases with D2/mol L-1 A/mol L-1 rate/mol increase in temperature. L-1s-1 (A) Both Assertion (A) and Reason (R) are true -3 0.05 0.05 1 × 10 and Reason (R) is the correct explanation of 0.15 0.05 3 ×10-3 Assertion (A). 0.05 0.15 9 × 10-3 (B) Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation 1 2 2 1 of Assertion (A). (A) k[D2 ] [A] (B) k[D2 ] [A] 1 1 2 2 (C) Assertion (A) is true and Reason (R) is false. (C) k[D2 ] [A] (D) k[D2 ] [A] (D) Assertion (A) is false and Reason (R) is true. Q21 For the reaction, 2SO2 + O2 ⇌ 2SO3, the rate of disappearance of O2 is 2 × 10-4 mol L-1 s-1. Q26 Assertion (A) : Reactions of higher order are The rate of appearance of SO3 is; rare. (A) 2 × 10−4 mol L−1 s−1 Reason (R) : The chances of simultaneous (B) 4 × 10−4 mol L−1 s−1 multimolecular collisions are extremely small. Android App | iOS App | PW Website  NEET (A) Both Assertion (A) and Reason (R) are true of Assertion (A). and Reason (R) is the correct explanation of (C) Assertion (A) is true and Reason (R) is false. Assertion (A). (D) Assertion (A) is false and Reason (R) is true. (B) Both Assertion (A) and Reason (R) are true Q30 Assertion (A) : For complex reactions but Reason (R) is not the correct explanation molecularity and order are not same. of Assertion (A). Reason (R) : Order of a reaction may be zero. (C) Assertion (A) is true and Reason (R) is false. (A) Both Assertion (A) and Reason (R) are true (D) Assertion (A) is false and Reason (R) is true. and Reason (R) is the correct explanation of Q27 Assertion (A): The half life period for a first order Assertion (A). reaction is independent of initial concentration (B) Both Assertion (A) and Reason (R) are true of reactants. but Reason (R) is not the correct explanation 0.693 Reason (R): For first order reaction,t1/2 = k. of Assertion (A). (A) Both Assertion (A) and Reason (R) are true (C) Assertion (A) is true and Reason (R) is false. and Reason (R) is the correct explanation of (D) Assertion (A) is false and Reason (R) is true. Assertion (A). Q31 Statement I: A catalyst provides an alternative (B) Both Assertion (A) and Reason (R) are true path to the reaction in which conversion of but Reason (R) is not the correct explanation reactants into products takes place quickly. of Assertion (A). Statement II: The catalyst forms an activated (C) Assertion (A) is true and Reason (R) is false. complex of lower potential energy with the (D) Assertion (A) is false and Reason (R) is true. reactants by which more number of molecules Q28 Assertion (A): For the first order reaction, the are able to cross the barrier per unit time. units of rate constant are time-1. (A) Statement I and Statement II both are Reason (R): The rate of first order reaction correct. remains constant throughout. (B) Statement I is correct but Statement II is (A) Both Assertion (A) and Reason (R) are true incorrect. and Reason (R) is the correct explanation of (C) Statement I is incorrect but Statement II is Assertion (A). correct. (B) Both Assertion (A) and Reason (R) are true (D) Statement I and Statement II both are but Reason (R) is not the correct explanation incorrect. of Assertion (A). Q32 Statement-I : The order of a reaction can have (C) Assertion (A) is true and Reason (R) is false. fractional value. (D) Assertion (A) is false and Reason (R) is true. Statement-II : The order of a reaction cannot Q29 Assertion (A) : A catalyst always increases the be written from balanced equation of a rate of a reaction. reaction. Reason (R): A catalyst forms an activated (A) Statement I and Statement II both are complex of lower potential energy then it correct. increases the rate of the reaction. (B) Statement I is correct but Statement II is (A) Both Assertion (A) and Reason (R) are true incorrect. and Reason (R) is the correct explanation of (C) Statement I is incorrect but Statement II is Assertion (A). correct. (B) Both Assertion (A) and Reason (R) are true (D) Statement I and Statement II both are but Reason (R) is not the correct explanation incorrect. Android App | iOS App | PW Website  NEET Q33 Statement-1: Concentration of reactant in zero following are necessary for collisions to order reaction is constant. successfully lead to reaction? Statement-II: For zero order reaction A →B, the 1. The total kinetic energy of the colliding successive half-life of reaction decreases with molecules must be greater than some the progress of the reaction. minimum value (A) Statement I and Statement II both are 2. A catalyst must be present at the collision. correct. 3. The colliding particles must be properly (B) Statement I is correct but Statement II is oriented in space when they collide. incorrect. (A) 1, 2 and 3 (B) 1 only (C) Statement I is incorrect but Statement II is (C) 1 and 3 (D) 2 and 3 correct. (D) Statement I and Statement II both are Q37 Which of the following graphs represents incorrect. exothermic reaction? Q34 Statement I: Molecularity does not influence the rate of reaction. Statement II: The overall kinetics of a reaction is governed by the slowest step in the reaction scheme. (A) Statement I and Statement II both are correct. (B) Statement I is correct but Statement II is incorrect. (C) Statement I is incorrect but Statement II is correct. (A) Only (I) (D) Statement I and Statement II both are (B) Only (II) incorrect. (C) Only (III) (D) Both (I) and (II) Q35 Statement-I : Order and molecularity are same for a complex reaction. Q38 Match the column I with column II. Statement-II : Order is determined Column I (Order of Column II (Expression) experimentally and in general molecularity is Reaction) the sum of the stoichiometric coefficient of rate determining elementary step. Zero order 1 (a) (I) t1/2 ∝ [A] 0 (A) Statement I and Statement II both are reaction correct. First order (B) Statement I is correct but Statement II is (b) (II) t100% = [A]0 /k reaction incorrect. (C) Statement I is incorrect but Statement II is Second order Involves at least correct. (c) (III) reactions two reactants (D) Statement I and Statement II both are incorrect. Pseudo (d) unimolecular (IV) [A] = [A]0 e− kt Q36 According to collision theory, most molecular reaction collisions don't lead to reaction. Which of the Android App | iOS App | PW Website  NEET (A) a-II, b-I, c-IV, d-II Column I Column II (B) a-II, b-IV, c-I, d-III (C) a-II, b-I, c-III, d-IV Catalyst alters (D) a-III, b-II, c-I, d-IV cannot be fraction (a) the rate of (I) or zero Q39 For a chemical reaction, reaction N2 (g) + 3H2 (g) ⇌ 2 NH3 (g) , the correct option is: proper orientation is (b) Molecularity (II) (A) 3 d[H2] = 2 d[NH3] not there always dt dt (B) − 1 d[H2] = − 1 d[NH3] 3 dt 2 dt By lowering the (C) − d[N2] = 2 d[NH3] (c) e− Ea / RT (III) dt dt activation energy d[N ] 1 d[NH3] (D) − dt2 = 2 dt Q40 A first order reaction has a specific reaction refers to the fraction -2 -1 Energetically rate of 10 s. How much time will it take for 20 of molecules with favourable g of the reactant to reduce to 5g? (d) (IV) energy equal to or reactions are (A) 138.6 s (B) 346.5 s greater than sometimes slow (C) 693.0 s (D) 238.6 s activation energy Q41 Match the column I with column II. (A) a-III, b-I, c-II, d-IV Column I Column II (B) a-IV, b-I, c-II, d-III Mathematical (C) a-III, b-I, c-IV, d-II (a) expression for (I) Rate constant (D) a-IV, b-III, c-I, d-II rate of reaction Rate of reaction Q43 Match the reactions of Lisi-I with their orders in for zero order List-II: (b) (II) Rate law reaction is List-I List-II equal to Units of rate C12 H22 O11 + H2 O constant for Pseudo first H+ (a) → (I) order of slowest C6 H12 O6 order (c) zero order (III) step + C6 H12 O6 reaction is CH3 COOC2 H5 same as HOH Order of a − CH3 COOH (b) −→ (II) Zero order OH− complex rate of a + C2 H5 OH (d) (IV) reaction is reaction hv (c) H2 + Cl2 → 2 HCl (III) Second order determined by (d) C2 H4 + H2 → C2 H6 (IV) First order (A) a-III, b-IV, c-I, d-II (B) a-II, b-I, c-IV, d-III (A) a-III, b-I, c-IV, d-II (C) a-III, b-IV, c-II, d-I (B) a-IV, b-I, c-IV, d-III (D) a-IV, b-III, c-II, d-I (C) a-IV, b-I, c-II, d-III (D) a-I, b-III, c-II, d-IV Q42 Match the column I with column II. Q44 Match the Column-I with Column-II. Android App | iOS App | PW Website  NEET Column I Column II rate = k[H2][Br2]l/2 (Rate Law) (Order) Which one of the following statements is true Rate = k × for this reaction? (a) (I) Second order (A) The reaction is of second order. Intensity of light (b) Rate = k [A]1[B]1 (II) Zero order (B) The molecularity of the reaction is 3/2. (C) The unit of k is s-1. Half order when A (c) Rate = k [A]3/2[B]1/2 (III) (D) The molecularity of the reaction is two. is excess Second order Q49 For a single step reaction, A + 2B→ Products, (d) Rate = k [A]2[B]1 (IV) when B is excess the molecularity is: (A) a-III, b-IV, c-I, d-II (A) Zero (B) Three (B) a-IV, b-I, c-II, d-III (C) Two (D) One (C) a-IV, b-III, c-I, d-II Q50 For a first order reaction, A→ Product, the rate (D) a-II, b-I, c-III, d-IV of reaction at [A ] = 0.2 mol L-1 is 1.0 x 10-2 mol L- 1 Q45 Match the List-I with List-II. min-1. The half life period for the reaction is: List-I List-II (A) 832 s (B) 440 s Molecularity of (C) 416 s (D) 14 s (a) decomposition of (I) 0 HI Order of radiactive (b) (II) 1 decay Temperature (c) (III) Between 2 to 3 coefficient Order of (d) decomposition of (IV) 2 HI on gold surface (A) a-III, b-I, c-II, d-IV (B) a-II, b-III, c-IV, d-I (C) a-III, b-IV, c-II, d-I (D) a-IV, b-II, c-III, d-I Q46 Rate expression of a chemical change is − dx dt = k[A]2 [B][C]0. The order of reaction is: (A) 3 (B) 2 (C) 1 (D) Zero Q47 For a zero order reaction; (A) t1/2 ∝ a (B) t1/2 ∝ 1a (C) t1/2 ∝ a2 (D) t1/2 ∝ 12 a Q48 For the reaction, H2(g) + Br2(g) → 2HBr(g), the reaction rate is: Android App | iOS App | PW Website  NEET Answer Key Q1 (A) Q26 (A) Q2 (B) Q27 (A) Q3 (D) Q28 (C) Q4 (A) Q29 (D) Q5 (A) Q30 (B) Q6 (D) Q31 (A) Q7 (C) Q32 (A) Q8 (B) Q33 (A) Q9 (A) Q34 (A) Q10 (B) Q35 (C) Q11 (A) Q36 (C) Q12 (C) Q37 (A) Q13 (B) Q38 (B) Q14 (C) Q39 (D) Q15 (C) Q40 (A) Q16 (A) Q41 (B) Q17 (D) Q42 (C) Q18 (B) Q43 (D) Q19 (B) Q44 (D) Q20 (A) Q45 (D) Q21 (B) Q46 (A) Q22 (A) Q47 (A) Q23 (B) Q48 (D) Q24 (D) Q49 (B) Q25 (B) Q50 (A) Android App | iOS App | PW Website