Test: Chemical Kinetics - 1 - Chemistry MCQ

In the Lineweaver–Burk plot of (initial rate)^–1 vs. (initial substrate concentration) ^–1 for an enzyme catalyzed reaction following Michaelis-Menten mechanism, the y–intercept is 5000 M^–1 s. If the initial enzyme concentration is 1*10^-6M, then turnover number is:  

For the first order reactionAfter two average lives, concentration of the reactant is reduced to:

V_max and K_m for an enzyme catalyzed reaction are 2.0 * 10^-3 Ms -1 and 1.0 * 10^-6 M, respectively. The rate of the reaction when the substrate concentration is 1.0 * 10^-6 M  is

Experimentally determined rate law for the chemical reaction,

The rate determining step consistent with the rate law is:

The rate of a chemical reaction doubles for every 10°C rise of temperature. If the temperature is raised by 50°C, the rate of the reaction increases by about 

For an enzyme-substrate reaction, a plot between  yields a slope of 40 s. If the enzyme concentration is 2.5 μM , then the catalytic efficiency of the enzyme is:

Acid hydrolysis of ester in first order reaction and rate constant is given by,

Where, V₀, V_t and V_∞ , are the volume of standard NaOH required to neutralize acid present as a given time, if ester is 50% neutralized then 

For the reaction, A (g) + 2B(g) → C(g ) + D (g) ,

Initial pressure of A and B are respectively 0.60 atm and 0.80 atm. At a time when pressure of C is 0.20 atm, rate of the reaction, relative to the initial value is:

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

The decomposition of ozone to oxygen,

Where, M is the catalyst molecule.
K’ are rate constants and E_a1 is the act ivat ion energy for the elementary step.

Q. 

Assuming k₃[O₃]>>k₂[O₂][M], the activation energy of the overall reaction is:
 

For the reaction shown below,

The value of k₁ is  . If the reaction starts from X, the ratio of the concentration of Y and Z at any given time during the course of the reaction is found to be The value of k₂ is

At T = 300K, the thermal energy [k_bT] in cm^–1 is approximately:

For the reaction,   the rate of formation of X₂ is:

In a homogenous catalytic reaction, 1.0 mM of a substrate band 1.0 μM of a catalyst yields 1.0 mM of a product in 10 s. The turnover frequency (TOF) of the reaction (s^-1) is.

The value of the rate constant for the gas phase reaction, 2NO₂ +F₂ →2NO₂F is 38 dm³ mol^–1s^–1 at 300K. The order of the reaction is:

A reaction follows second order rate law,