# For a reaction A Product, rate law is $-\frac{d\left[A\right]}{dt}=K\left[A{\right]}_{0}$. The concentration of A left after time t when $t=\frac{1}{K}$ is: 1. $\frac{\left[A{\right]}_{0}}{e}$ 2.  3. $\frac{\left[A{\right]}_{0}}{{e}^{2}}$ 4. $\frac{1}{\left[A{\right]}_{0}}$

Subtopic:  First Order Reaction Kinetics |
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For an exothermic chemical process occurring in two steps as;

(i) A+B$\to$X(Slow)

(ii) X$\to$AB (Fast)

The progress of the reaction can be best described by:

 1 2 3 4 All of the above.

Subtopic:  Arrhenius Equation |
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For a non-stoichiometric reaction 2A + B $\to$ 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 |
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For the reaction N2 + 3H2 $\to$ 2NH3, the rate $\frac{\mathrm{d}\left[{\mathrm{NH}}_{3}\right]}{\mathrm{dt}}$= 2 x 10-4 M s-1 .Therefore, the rate $\frac{-\mathrm{d}\left[{\mathrm{N}}_{2}\right]}{\mathrm{dt}}$ is given as:

1. 10-4 Ms-1

2. 104 Ms-1

3. 10-2 sM-1

4. 10-4 sM-1

Subtopic:  Definition, Rate Constant, Rate Law |
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If 'I' is the intensity of absorbed light and 'c' is the concentration of AB for the photochemical process AB + hv→  AB *, the rate of formation of AB * is directly proportional to:

1. c

2. I

3. I2

4. cI

Subtopic:  Definition, Rate Constant, Rate Law |
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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 |
91%
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The rate of a reaction get doubles when the temperature changes from 7°C to 17°C. By what factor will it change for the temperature change from 17°C to 27°C?

1. 1.81

2. 1.71

3. 1.91

4. 1.76

Subtopic:  Arrhenius Equation |
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In the Arrhenius equation K = Ae-Ea/RT, the quantity e-Ea/kT is referred as:

1. Boltzmann factor.

2. Frequency factor.

3. Activation factor.

4. None of the above.

Subtopic:  Arrhenius Equation |
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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%
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