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Chemical Kinetics · Question 61

AIPMT 2006MCQEasy📈 Topic in 12% papers+4−1
1

For the reaction, 2A + B 3C + D, which of the following does not express the reaction rate?

  1. - d[A]2dt
  2. - d[C]3dt
  3. - d[B]dt
  4. d[D]dt

Answer

(2) - d[C]3dt

Solution

Rate = - 12 d[A]dt = - d[B]dt = + 13 d[C]dt = + d[D]dt

∵ C is a product, its concentration increases, so the rate in terms of C is + d[C]3dt, not - d[C]3dt (that would be negative).

∴ - d[C]3dt does not express the reaction rate.

Answer: (2)

AIPMT 2006

Keep practising — Chemical Kinetics

2

The rate of reaction between two reactants A and B decreases by a factor of 4 if the concentration of reactant B is doubled. The order of this reaction with respect to reactant B is

  1. 2
  2. -2
  3. 1
  4. -1
AIPMT 2005
3

For a first order reaction A B the reaction rate at reactant concentration of 0.01 M is found to be 2.0 10-5 mol L-1 s-1. The half-life period of the reaction is

  1. 30 s
  2. 220 s
  3. 300 s
  4. 347 s
AIPMT 2005
4

The rate of a first order reaction is 1.5 10-2 mol L-1 min-1 at 0.5 M concentration of the reactant. The half-life of the reaction is

  1. 0.383 min
  2. 23.1 min
  3. 8.73 min
  4. 7.53 min
AIPMT 2004
5

The temperature dependence of rate constant (k) of a chemical reaction is written in terms of Arrhenius equation, k = A e-E*/RT. Activation energy (E*) of the reaction can be calculated by plotting

  1. k vs T
  2. k vs 1 T
  3. log k vs 1T
  4. log k vs 1 T
AIPMT 2003
6

If the rate of the reaction is equal to the rate constant, the order of the reaction is

  1. 0
  2. 1
  3. 2
  4. 3
AIPMT 2003
7

The reaction A B follows first order kinetics. The time taken for 0.8 mole of A to produce 0.6 mole of B is 1 hour. What is the time taken for conversion of 0.9 mole of A to produce 0.675 mole of B?

  1. 1 hour
  2. 0.5 hour
  3. 0.25 hour
  4. 2 hours
AIPMT 2003
8

The activation energy for a simple chemical reaction A B is Ea in forward direction. The activation energy for reverse reaction

  1. is negative of Ea
  2. is always less than Ea
  3. can be less than or more than Ea
  4. is always double of Ea
AIPMT 2003
9

The radioisotope, tritium (13H) has a half-life of 12.3 years. If the initial amount of tritium is 32 mg, how many milligrams of it would remain after 49.2 years?

  1. 1 mg
  2. 2 mg
  3. 4 mg
  4. 8 mg
AIPMT 2003
10

2A B + C It would be a zero order reaction when

  1. the rate of reaction is proportional to square of concentration of A
  2. the rate of reaction remains same at any concentration of A
  3. the rate remains unchanged at any concentration of B and C
  4. the rate of reaction doubles if concentration of B is increased to double
AIPMT 2002
11

When a bio-chemical reaction is carried out in laboratory, outside the human body in absence of enzyme, then rate of reaction obtained is 10-6 times, the activation energy of reaction in the presence of enzyme is

  1. 6/RT
  2. P is required
  3. different from Ea obtained in laboratory
  4. can't say anything.
AIPMT 2001

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