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Showing posts with label CHEMICAL KINETICS. Show all posts
Showing posts with label CHEMICAL KINETICS. Show all posts
Sunday, May 26, 2024

Derivation of Van't Hoff equation.

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This equation gives the quantitative temperature dependance of equilibrium constant K.  The relation between standard free energy change ∆G°...
Tuesday, September 5, 2023

A certain Zero order reaction has rate constant K is 0.025 MS^-1 for disappearance of A . What will be the concentration of A after 15 sec if initial concentration is A is 0.5M.

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(A)  2.5 M     (B)  0.5 M  (C)  1.5 M   (D)   0.125 M

The rate constant for zero order reaction is 2× 10^-2 Mole L^-1 sec-1. If the concentration of reactant after 25 sec is 0.5M ,the initial concentration must have been ?

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(A) 1M (B) 2M (C) 1.5M  (D) 2.5M

Consider a general reaction A--->B follow zero order kinetics.if concentration of A is reduces from 0.1 M to 0.05 M in 10 second then calculate time taken when concentration reduce to 0.025 M.

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(A) 2.5 sec     (B)  2 sec  (C)   5 sec     (D)  10 sec
Thursday, November 25, 2021

A metal slowly forms an oxide film which completely protects the metal when the film thickness is 3.956 thousands of an inch. If the film thickness is 1.281 thousands. in 6 weeks, how much longer will it be before it is 2.481 thou? The rate of film formation follows first order kinetics.

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2 comments:

A bacterial growth follows first order kinetics and it is observed that increase in bacteria is by `10%` in 10 min. How long willl it take to increase bacteria concentration to double of original?

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Tuesday, November 23, 2021

Class Claperon equation:

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Vapour pressure  is directly proportional to the  Temperature so that on increasing temperature the rate of evaporation increases and rate o...

What is relation between equilibrium constant and activation energy ?

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Monday, May 10, 2021

In Arrhenius equation for a certain reaction, the value of A and Ea (activation energy) are 4x 10^13 sec^-1 and 98.6 kJ mole^-1 respectively. At what temperature, the reaction will have specific rate constant 1.1x 10^-3 sec^-1.

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  Arrhenius equation: The temperature dependence of rate of a chemical reaction can be accurately explained by Arrhenius equation. It was fi...
Thursday, October 1, 2020

The energy of activation for a reaction is 100 kJ mol^-1. Presence of a catalyst lowers the energy of activation by 75%. What will be effect on rate of reaction at 20”C, other things being equal ?

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  Related Questions: What is Arrhenius equation ? what happen when activation energy of a chemical reaction becomes equal to RT? What is the...

At 407 K the rate constant of a chemical reaction is 9.5 x10^-5s^-1 and at 420 K, the rate constant is 1.9 x10^-4s^-1. Calculate the frequency factor of the reaction.

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  Related Questions: What is Arrhenius equation ? what happen when activation energy of a chemical reaction becomes equal to RT? What is the...

In Arrhenius equation for a certain reaction, the value of A and Ea (activation energy) are 4 x10^13 sec^1 and 98.6 kJ mol1 respectively. At what temperature, the reaction will have specific rate constant 1.1x10^-3 sec^-1 ?

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  Related Questions: What is Arrhenius equation ? what happen when activation energy of a chemical reaction becomes equal to RT? What is the...

The rate of a reaction triple when temperature changes from 20”C to 50”C. Calculate energy of activation for the reaction (R = 8.314 JK^-1 mol^-1).

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Related Questions: What is Arrhenius equation ? what happen when activation energy of a chemical reaction becomes equal to RT? What is the a...

A first order reaction is 20 % completed in 10 minutes. Calculate the time taken for the reaction to go to 80 % completion.

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  Related Questions: What is Arrhenius equation ? what happen when activation energy of a chemical reaction becomes equal to RT? What is the...

A drug becomes ineffective after 30 % decomposition. The original concentration of a sample was 5mg/mL which becomes 4.2 mg/mL during 20 months. Assuming the decomposition of first order , calculate the expiry time of the drug in months. What is the half life of the product?

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  Related Questions: What is Arrhenius equation ? what happen when activation energy of a chemical reaction becomes equal to RT? What is the...
Monday, September 21, 2020

Chemical Kinetics

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KINETICS OF ZERO ORDER REACTIONS: Kinetics of first order reactions Kinetics of nth order reactions PARALLEL PATH OR CONCURRENT ELEMENTARY R...
Tuesday, July 21, 2020

Decomposition of H2O2 follows a first order reaction. In fifty minutes the concentration of H2O2 decreases from 0.5 to 0.125 M in one such decomposition. When the concentration of H2O2 reaches 0.05 M, the rate of formation of O2 will be : [JEE MAINS 2016]

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Saturday, June 27, 2020

What is Arrhenius equation ?

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The temperature dependence of rate of a chemical reaction can be accurately explained by Arrhenius equation. It was first proposed by Dutch ...
1 comment:
Tuesday, June 9, 2020

Consider the following reaction: A(g) + B(g) --> AB (g)The activation energy of backward reaction exceeds that of the forward reaction by 2RT (in J per mole). If the pre-exponential factor of forward reaction is 4 times of the reverse reaction. The absolute value of (G) Gibbs energy at STP (in j per mole) for the reaction at 300 K is (Given ln2= 0.7, RT= 2500 J per Mole at 300 K and G is the Gibbs energy) (JEE Advanced 2018)

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SOLUTION:   Given condition

What is the activation energy and how to different from threshold energy ?

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Threshold Energy and Activation Energy: Threshold energy(THE):  For a reaction to take place the reacting molecules must colloid together, b...