The rate constant for a first order reaction is $60s^{-1}$. How much time will it take to reduce the initial concentration of the reactant to its 1/16th value –

(A) 0.046 s                                                         

(B) 0.46 s

(C) 1.124 s                                                         

(D) 2.123 s

The decomposition of A into product has value of k as \(4.5 \times 10^3 \mathrm{~s}^{-1} \text { at } 10^{\circ} \mathrm{C}.\) Energy of activation of the reaction is \(60 \mathrm{~kJ}~mol^{-1}.\) The temperature at which value k would become \(1.5\times10^4~s^{-1}\) is : 

The half life period of gaseous substance undergoing thermal decomposition was measured for various initial pressure ‘P’ with the following result. 

P(mm)       250     300      400     450

$t_{1/2}$(min)   136    112.5     85      75.5

Calculate the order of reaction.

(A) 2                                                 

(B) 4

(C) 6                                                 

(D) 10

The rate constant of a particular reaction has the dimension of frequency. The order of the reaction is: 

1. Zero.                                                     

2. First.

3. Second.                                                 

4. Fractional.

The rate constant of a first-order reaction increases from 1.667 × 10⁻⁶ s⁻¹ at 727 °C to 1.667 × 10⁻⁴ s⁻¹ at 1571 °C. Assuming that the activation energy remains constant, calculate the rate constant at 1150 °C.

The thermal decomposition of a compound is of first order. If 50 % of a sample of the compound decomposes in 120 minutes, how long will it take for 90 % of the compound to decompose?

1. 399 min                                                        

2. 410 min

3. 250 min                                                        

4. 120 min

The rate of a reaction becomes three times when the temperature is increased from 20 °C to 50 °C.
Calculate the activation energy of the reaction.

A catalyst lowers the activation energy of a reaction from 20 kJ mol^–1 to 10 kJ mol^-1. The temperature at which the uncatalysed reaction will have the same rate as that of the catalysed at 27 ^oC will be:
1. \(-123\ ^{\circ}C\)
2. \(-327\ ^{\circ}C\)
3. \(327\ ^{\circ}C\)
4. \(23\ ^{\circ}C\)

The rate constant, activation energy and Arrhenius factor of a reaction at 25°C are
3.0 × 10⁻⁴ s⁻¹, 104.4 kJ mol⁻¹, and 6.0 × 10¹⁴ s⁻¹, respectively.
Find the rate constant as the temperature approaches infinity.

1. 2.0 × 10¹⁸ s^-1                                                  

2. 6.0 × 10¹⁴ s^-1

3. $Infinity\; (\infty )$                                                                   

4. 3.6 × 10³⁰ s^-1

The kinetic data for the reaction: 2A + B₂ → 2AB are as given below

The order of reaction with respect to A and B₂ is, respectively: