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Chemical Kinetics · Question 31

NEET 2016 (Phase 1)MCQEasy📈 Topic in 0% papers+4−1
1

The addition of a catalyst during a chemical reaction alters which of the following quantities?

  1. Enthalpy
  2. Activation energy
  3. Entropy
  4. Internal energy

Answer

(2) Activation energy

Solution

As per NCERT, a catalyst provides an alternate pathway (reaction path) of lower activation energy.

Enthalpy, entropy and internal energy are state functions; they depend only on the initial and final states, which a catalyst does not change.

∴ A catalyst alters only the activation energy.

Answer: (2)

NEET 2016 (Phase 1)

Keep practising — Chemical Kinetics

2

The decomposition of phosphine (PH3) on tungsten at low pressure is a first-order reaction. It is because the

  1. rate is proportional to the surface coverage
  2. rate is inversely proportional to the surface coverage
  3. rate is independent of the surface coverage
  4. rate of decomposition is very slow.
NEET 2016 (Phase 2)
3

The rate constant of the reaction A B is 0.6 10-3 mol L-1 s-1. If the concentration of A is 5 M, then concentration of B after 20 minutes is

  1. 3.60 M
  2. 0.36 M
  3. 0.72 M
  4. 1.08 M
AIPMT 2015
4

The activation energy of a reaction can be determined from the slope of which of the following graphs?

  1. k vs. 1T
  2. T k vs. 1T
  3. k vs. T
  4. kT vs. T
AIPMT 2015 (Cancelled)
5

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.
AIPMT 2015 (Cancelled)
6

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
7

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
8

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)
9

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)
10

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)
11

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)

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