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Chemical Kinetics · Question 19

NEET (UG) 2022 (Phase 2)MCQEasy📈 Topic in 12% papers+4−1
1

For a chemical reaction 4A + 3B 6C + 9D Rate of formation of C is 6 10-2 mol L-1 s-1 and rate of disappearance of A is 4 10-2 mol L-1 s-1. The rate of reaction and amount of B consumed in interval of 10 seconds, respectively will be :

  1. 10 10-2 mol L-1 s-1 and 30 10-2 mol L-1
  2. 1 10-2 mol L-1 s-1 and 30 10-2 mol L-1
  3. 10 10-2 mol L-1 s-1 and 10 10-2 mol L-1
  4. 1 10-2 mol L-1 s-1 and 10 10-2 mol L-1

Answer

(2) 1 10-2 mol L-1 s-1 and 30 10-2 mol L-1

Solution

Rate = - 14 d[A]dt = - 13 d[B]dt = 16 d[C]dt = 19 d[D]dt

Rate = 16 6 10-2 = 1 10-2 mol L-1 s-1

(check: 14 4 10-2 = 1 10-2)

Rate of consumption of B = 3 1 10-2 = 3 10-2 mol L-1 s-1

B consumed in 10 s = 3 10-2 10

= 30 10-2 mol L-1

Answer: (2)

NEET (UG) 2022 (Phase 2)

Keep practising — Chemical Kinetics

2

For a reaction, A B, enthalpy of reaction is -4.2 kJ mol-1 and enthalpy of activation is 9.6 kJ mol-1. The correct potential energy profile for the reaction is shown in option.

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
NEET (UG) 2021
3

The slope of Arrhenius plot ( ln k v/s 1T ) of first order reaction is -5 103 K. The value of Ea of the reaction is. Choose the correct option for your answer. [Given R = 8.314 J K-1 mol-1]

  1. -83 kJ mol-1
  2. 41.5 kJ mol-1
  3. 83.0 kJ mol-1
  4. 166 kJ mol-1
NEET (UG) 2021
4

An increase in the concentration of the reactants of a reaction leads to change in :

  1. heat of reaction
  2. threshold energy
  3. collision frequency
  4. activation energy
NEET (UG) 2020
5

The rate constant for a first order reaction is 4.606 10-3 s-1. The time required to reduce 2.0 g of the reactant to 0.2 g is :

  1. 200 s
  2. 500 s
  3. 1000 s
  4. 100 s
NEET (UG) 2020
6

If the rate constant for a first order reaction is k, the time (t) required for the completion of 99 % of the reaction is given by :

  1. t = 4.606k
  2. t = 2.303k
  3. t = 0.693k
  4. t = 6.909k
NEET (UG) 2019
7

For the chemical reaction N2(g) + 3H2(g) 2NH3(g) the correct option is :

  1. - d[N2]dt = 2 d[NH3]dt
  2. - d[N2]dt = 12 d[NH3]dt
  3. 3 d[H2]dt = 2 d[NH3]dt
  4. - 13 d[H2]dt = - 12 d[NH3]dt
NEET (UG) 2019
8

The correct difference between first and second order reactions is that

  1. the rate of a first-order reaction does not depend on reactant concentrations; the rate of a second-order reaction does depend on reactant concentrations
  2. the half-life of a first-order reaction does not depend on [A]0; the half-life of a second order reaction does depend on [A]0
  3. a first-order reaction can be catalysed; a second-order reaction cannot be catalysed
  4. the rate of a first-order reaction does depend on reactant concentrations; the rate of a second-order reaction does not depend on reactant concentrations
NEET 2018
9

When initial concentration of the reactant is doubled, the half-life period of a zero order reaction

  1. is halved
  2. is doubled
  3. is tripled
  4. remains unchanged.
NEET 2018
10

Mechanism of a hypothetical reaction X2 + Y2 2XY, is given below : (i) X2 X + X (fast) (ii) X + Y2 XY + Y (slow) (iii) X + Y XY (fast) The overall order of the reaction will be

  1. 2
  2. 0
  3. 1.5
  4. 1
NEET 2017
11

A first order reaction has a specific reaction rate of 10-2 sec-1. How much time will it take for 20 g of the reactant to reduce to 5 g?

  1. 138.6 sec
  2. 346.5 sec
  3. 693.0 sec
  4. 238.6 sec
NEET 2017

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