The decomposition of N2O5 in CCl4 at 318K has been studied by monitoring the concentration of N2O5 in the solution. Initially, the concentration of N2O5 is 2.33 mol L–1 and after 184 minutes, it is reduced to 2.08 mol L–1. The reaction takes place according to the equation

2 N2O5 (g)  4 NO2 (g) + O2 (g)

The rate of production of NO2 during this period is-

1. 5.72 × 10
–3 mol L–1 min–1
2. 2.72 × 10
–3 mol L–1 min–1
3. 1.72 × 10
–5 mol L–1 min–1
4. 6.72 × 10
–4 mol L–1 min–1
 

Subtopic:  Definition, Rate Constant, Rate Law |
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The rate equation for the reaction 2A+B→C is found to be:
rate = k [A] [B]
The correct statement in relation to this reaction is that the:

1. Unit of k must be s-1
2. t1/2 is a constant
3. Rate of formation of C is twice the rate of disappearance of A
4. Value of k is independent of the initial concentrations of A and B
Subtopic:  Definition, Rate Constant, Rate Law |
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For a reaction, A + B → Product; the rate law is given by, r=k[A]1/2[B]2. The order of the reaction is:
1. -1.5 2. 1.5
3. 0.5 4. 2.5
Subtopic:  Order, Molecularity and Mechanism |
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For the reaction, A + B → Products
Experiment [A] [B] Rate (mole litre-1 min-1)
1. 0.01 0.01 2 × 10-4
2. 0.02 0.01 4 × 10-4
3. 0.01 0.02 8 × 10-4
The rate law and unit of rate constant respectively, are:
 
1. Rate = K [A]2 [B] and litre2 mole-2 min-1
2. Rate = K [A]3 and litre2 mole-2 min-1
3. Rate = K [A] [B]2 and litre mole-1 min-1
4. Rate = K [A] [B]2 and litre2 mole-2 min-1

 
Subtopic:  Order, Molecularity and Mechanism |
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For the reaction, 2A → B, rates= k[A]2. If the concentration of reactant is doubled, then the:

(a) rate of reaction will be doubled.
(b) rate constant will remain unchanged, however rate of reaction is directly proportional to the rate constant.
(c) rate constant will change since the rate of reaction and rate constant are directly proportional to each other.
(d) rate of reaction will increase by four times.

Identify the set of correct statements & choose the correct answer from the options given below:

1. (a) and (c) only 2. (a) and (b) only
3. (b) and (d) only 4. (c) and (d) only
Subtopic:  Definition, Rate Constant, Rate Law |
 69%
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H2 gas is absorbed on the metal surface like tungsten. This follows ________ order reaction:

1. Third 

2. Second 

3. Zero 

4. First 

Subtopic:  Order, Molecularity and Mechanism |
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Which of the following statements is not true for the rate constant, k?
 
1. large value of k indicates fast reactions.
2. The value of k is independent of the concentration of reactants
3. The value of k is independent of the concentration of products
4. The value of the rate constant, k, as the name suggests is always constant for a particular reaction at all temperatures.

 
Subtopic:  Arrhenius Equation |
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The rate constant for a reaction of zero-order in A is 0.0030 mol L-1 s-1. How long will it take for the initial concentration of A to fall from 0.10 M to 0.075 M?

1. 8.3 sec

2. 0.83 sec

3. 83 sec

4. 10.3 sec

Subtopic:  Definition, Rate Constant, Rate Law |
 78%
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Given the reaction, \(A + B \rightarrow Products,\) , when concentration of A is fixed and concentration of B is increased 3 times then rate of reaction increases 27 times. Now, when the concentration of A and B both are doubled, then the rate of reaction increases 8 times. The rate law for the reaction will be
1. \(Rate = K [A]^2[B] \)
2. \(Rate = K [B]^3 \)
3. \(Rate = K [A]^3[B] \)
4. \(Rate = K [A]^3[B]^2\)
Subtopic:  Order, Molecularity and Mechanism |
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The plot of concentration of a reactant vs. time for a chemical reaction is shown below:

The order of this reaction with respect to the reactant is:
1. 0
2. 1
3. 2
4. not possible to determine from this plot
Subtopic:  Order, Molecularity and Mechanism |
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