Chemical Kinetics

For the reaction, N₂ + 3H₂ → 2NH₃, If  the value of  would be

• 3 x 10^-4 mol L^-1 s^-1

• 4 x 10^-4 mol L^-1s^-1

•  6 x 10^-4 mol L^-1s^-1

•  6 x 10^-4 mol L^-1s^-1

In the reaction,


The rate of appearance of bromine (Br)₂ is related to rate of disappearnace of bromide ions as following

The rate constant k₁ and k₂ for two different reactions are 10¹⁶. e^-2000/T and 10¹⁵.e^-1000/T respectively. The temperature at which k₁ = k₂

• 1000 K 

• 2000/2.303 K 

• 2000 K 

• 2000 K 

The bromination of acetone cytosine and guanine solution is represented by this equation.
 CH₃COCH₃ (aq) + Br₂ (aq) →CH₃COCH₂Br (aq) + H⁺ (aq) + Br^- (aq)
These kinetic data were obtained for given reaction concentrations.

• Rate = k[CH₃COCH₃][H⁺]

• Rate = k[CH=COCH₃][Br₂]

• Rate = k [CH₃COCH₃][Br₂][H⁺]

• Rate = k [CH₃COCH₃][Br₂][H⁺]

The reaction of hydrogen and iodine monochloride is given as:
H₂ (g) + 2ICl (g) → 2 HCl (g)  + I₂ (g)
This reaction is of first order with respect to H₂ (g) and ICI (g), following mechanisms were proposed:

Mechanism A:
H₂ (g) + 2 ICl (g)  → 2 HCl (g) + I₂ (g) 

Mechanism B:
H₂ (g) + ICl (g) →HCl (g) + HI (g) ;slow
HI (g) + ICl (g)  → HCl (g) + I₂ (g); fast

Which of the above mechanism (s) can be consistent with the given information about the reaction? 

• B only

• A and B both

• Neither A nor B

• Neither A nor B

In a first order reaction A →B, if k israte constant and initial concentration of the reactant A is 0.5 A M then the half -life is : 

• 0.693/0.5 k

• log2/k

• 
• 

If 60% of a first order reaction was completed in 60 min, 50% of the same reaction would be completed in approximately:

• 50 min

• 45 min

• 60 min

• 60 min

For the reaction 

2A + B → 3C + D

Which of the following does not express the reaction rate?

Consider the reaction

N₂ (g) + 3 H₂ (g) → 2 NH₃ (g) 

The equality relationship between  is:

Which one of the following statements is not correct?

• Catalyst does not initiate any reaction

• The value of equilibrium constant is changed in the presence of a catalyst in the reaction at equilibrium

• Enzymes catalyse mainly bio-chemical reactions
  
  

• Enzymes catalyse mainly bio-chemical reactions