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Chemical Kinetics · Question 35

AIPMT 2015 (Cancelled)MCQEasy📈 Topic in 38% papers+4−1
1

When initial concentration of a reactant is doubled in a reaction, its half-life period is not affected. The order of the reaction is

  1. second
  2. more than zero but less than first
  3. zero
  4. first.

Answer

(4) first.

Solution

For an nth order reaction, t1/2 1[R]0 n-1

Half-life independent of [R]0 ⇒ n - 1 = 0 ⇒ n = 1

As per NCERT, for a first order reaction t1/2 = 0.693k, which does not depend on the initial concentration.

Answer: (4)

AIPMT 2015 (Cancelled)

Keep practising — Chemical Kinetics

2

A reaction having equal energies of activation for forward and reverse reactions has

  1. H = 0
  2. H = G = S = 0
  3. S = 0
  4. G = 0
NEET 2013
3

What is the activation energy for a reaction if its rate doubles when the temperature is raised from 20 C to 35 C? (R = 8.314 J mol-1 K-1)

  1. 34.7 kJ mol-1
  2. 15.1 kJ mol-1
  3. 342 kJ mol-1
  4. 269 kJ mol-1
NEET 2013
4

For a reaction between A and B the order with respect to A is 2 and the order with respect to B is 3. The concentrations of both A and B are doubled, the rate will increase by a factor of

  1. 12
  2. 16
  3. 32
  4. 10
NEET 2013 (Karnataka)
5

A reaction is 50\% complete in 2 hours and 75\% complete in 4 hours. The order of reaction is

  1. 1
  2. 2
  3. 3
  4. 0
NEET 2013 (Karnataka)
6

Activation energy (Ea) and rate constants (k1 and k2) of a chemical reaction at two different temperatures (T1 and T2) are related by

  1. k2k1 = - EaR ( 1T1 - 1T2 )
  2. k2k1 = - EaR ( 1T2 - 1T1 )
  3. k2k1 = - EaR ( 1T2 + 1T1 )
  4. k2k1 = EaR ( 1T1 - 1T2 )
AIPMT 2012 (Mains)
7

In a reaction, A + B product, rate is doubled when the concentration of B is doubled, and rate increases by a factor of 8 when the concentrations of both the reactants (A and B) are doubled, rate law for the reaction can be written as

  1. rate = k[A][B]2
  2. rate = k[A]2[B]2
  3. rate = k[A][B]
  4. rate = k[A]2[B]
AIPMT 2012 (Prelims)
8

In a zero-order reaction, for every 10 rise of temperature, the rate is doubled. If the temperature is increased from 10 to 100 , the rate of the reaction will become

  1. 256 times
  2. 512 times
  3. 64 times
  4. 128 times
AIPMT 2012 (Prelims)
9

The rate of the reaction: 2N2O5 4NO2 + O2 can be written in three ways. -d[N2O5]dt = k [N2O5] d[NO2]dt = k' [N2O5]; d[O2]dt = k'' [N2O5] The relationship between k and k' and between k and k'' are

  1. k' = 2k; k'' = k
  2. k' = 2k; k'' = k/2
  3. k' = 2k; k'' = 2k
  4. k' = k; k'' = k
AIPMT 2011 (Mains)
10

The unit of rate constant for a zero order reaction is

  1. mol L-1 s-1
  2. L mol-1 s-1
  3. L2 mol-2 s-1
  4. s-1
AIPMT 2011 (Mains)
11

The half-life of a substance in a certain enzyme-catalysed reaction is 138 s. The time required for the concentration of the substance to fall from 1.28 mg L-1 to 0.04 mg L-1 is

  1. 414 s
  2. 552 s
  3. 690 s
  4. 276 s
AIPMT 2011 (Mains)

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