A hypothetical reaction, A2 +B2  2AB mechanism as given below;

A2 A+ A          ............(Fast)

A+B2 → AB + B   ............(Slow)

A+ → AB         ............(Fast)

The order of the overall reaction is:

1. 2

2. 1

3. 1.5

4. zero

Subtopic:  Order, Molecularity and Mechanism |
 55%
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NEET 2023 - Target Batch - Aryan Raj Singh
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For a non-stoichiometric reaction 2A + B  C +D, the following kinetic data were obtained in three separate experiments, all at 298 K.

 Initial 

Concentration (A)

 Initial Concentration (B)  Initial rate of formation of C (mol L-1 S-1)
         0.1 M         0.1 M  1.2×10-3
         0.1 M         0.2 M 1.2×10-3
         0.2 M         0.1 M  2.4×10-3

The rate law for the formation of C is:

1. d[C]/dt = k[ A][B]

2. d[C]/dt = k[ A]2[B]

3. d[C]/dt = k[ A][B]2

4. d[C]/dt = k[ A]

Subtopic:  Order, Molecularity and Mechanism |
 63%
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh

Which curve represents zero order reaction?

1. 

2. 

3. 

4. 

Subtopic:  Order, Molecularity and Mechanism |
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In a reaction, the rate expression is, rate = K[A][B]2/3[C]0 , the order of the reaction is:

1. 1

2. 2

3. 5/3

4. zero

Subtopic:  Order, Molecularity and Mechanism |
 92%
From NCERT
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For the elementary step, (CH3)3.CBr(aq) → (CH3)3C+ (aq) + Br- (aq), the molecularity is:

1. Zero

2. 1

3. 2

4. Cannot be ascertained

Subtopic:  Order, Molecularity and Mechanism |
 70%
From NCERT
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A drop of solution (volume 0.05 mL) contains 3.0 x10-6 mole of H+. If the rate constant of disappearance of H+ is 1.0x107 mol litre sec?. How long would it take for H+ in drop to disappear?

1. 6x10-8 sec

2. 6x10-7 sec

3. 6x10-9 sec

4. 6x10-10 sec

Subtopic:  Order, Molecularity and Mechanism |
 56%
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A zero order reaction is one:

1. in which reactants do not react

2. in which one of the reactants is in large excess

3. whose rate does not change with time

4. whose rate increases with time

Subtopic:  Order, Molecularity and Mechanism |
 71%
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh
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NEET 2023 - Target Batch - Aryan Raj Singh

The rate constant value for a zero-order reaction is 2 x10-2 mol L-1 sec-1. If the concentration of the reactant after 25 sec is 0.5 M, then the initial concentration of reactant is: 

1. 0.5 M

2. 1.25 M

3. 12.5M

4. 1.0 M

Subtopic:  Order, Molecularity and Mechanism |
 75%
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh
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NEET 2023 - Target Batch - Aryan Raj Singh

The rate constant for a second order reaction is 8x10-5 M-1 min-1 . How long will it take a 1M solution to be reduced to 0.5M?

1. 8.665 x 103 minute

2. 8 x 10-5 minute

3. 1.25 x 104 minute

4. 4x10-5 minute

Subtopic:  Order, Molecularity and Mechanism |
 69%
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Which order of reaction obeys the relation t1/2 = 1/Ka?

1. First

2. Second

3. Third

4. Zero

Subtopic:  Order, Molecularity and Mechanism |
 68%
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NEET 2023 - Target Batch - Aryan Raj Singh
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