MEDIUM
JEE Main/Advance
IMPORTANT
Earn 100

The reaction A(aq)B (aq) is monitored by measuring optical rotation of reaction mixture at different time interval. The species $A, B$ and $C$ are optically active with specific rotations 20°,30° and -40° Respectively. Starting with pure A if the value of optical rotations was found to be 2.5° after 6.93 Minutes and optical rotations was -5° After infinite time. Find the rate constant for order conversion of A into B and C.

50% studentsanswered this correctly

Important Questions on Chemical Kinetics

MEDIUM
JEE Main/Advance
IMPORTANT

Isomerization of cyclobutene into 1,3 -butadine follow first order kinetics as :

Question Image

The kinetic study was performed by taking same amounts of cyclobutene in three sealed flasks. First flask was broken after 20 minute and the reaction mixture was absorbed completely in bromine solution. 16.0 mL1.0M bromine solution was required. The second flask was broken after a very long time and the reaction mixture required20 mL bromine solution of the same strength. If the third flask was broken after 30 minute, what volume of bromine solution of same strength would have been required?

MEDIUM
JEE Main/Advance
IMPORTANT

Decomposition of both A2g and B3g Follows 1st order kinetic as :

A2gK12 Ag             K1hr-1=102e14000RTB3gK23 Bg             K2hr-1=103e20000RT

If one mole of each A2g and B3g Are taken in a 10 L Evacuated flask and heated to some temperature so that they start decomposing at the same rate, determine total pressure in the flask after 1.0 hr.

MEDIUM
JEE Main/Advance
IMPORTANT
A 1st order chemical reaction was carried out for 1.0 hour in absence of a catalyst and 20% reaction was complete. A catalyst was then added and reaction was allowed to continue for next 30 min when 60% reaction was complete. A second catalyst was then added at this time and reaction was allowed to continue for further 10 min. when  90% reaction was complete. If activation energy of the original path was 80 kJ, determine activation energy of catalyzed pathways. Assume constant temperature throughout to be 300 K 
MEDIUM
JEE Main/Advance
IMPORTANT
The oxidation of certain metals is found to obey the equation τ2=αt+β where τ is the thickness of the oxide film at time t,α and β are constants. What is the order of this reaction?
MEDIUM
JEE Main/Advance
IMPORTANT

At room temperature 20°C orange juice gets spoilt in about 64 hours. In a refrigerator at 3°C juice can be stored three times as long before it gets spoilt. Estimate

(a) the activation energy of the reaction that causes the spoiling of juice.

MEDIUM
JEE Main/Advance
IMPORTANT

A certain organic compound AA decomposes by two parallel first order mechanism

Question Image 

If k1:k2=1:9 and k1=1.3×10-5 s-1

Calculate the concentration ratio of C to A, if experiment is started with only A and allowed to run for one hour.

MEDIUM
JEE Main/Advance
IMPORTANT
An optically active compound A upon acid catalysed hydrolysis yield two optically active compound B and C by pseudo first order kinetics. The observed rotation of the mixture after 20 min was 5° while after completion of the reaction it was -20°. If optical rotation per mole of A, B & C are 60°,40° &-80°, calculate half life and average life of the reaction.
MEDIUM
JEE Main/Advance
IMPORTANT
A vessel contains dimethyl ether at a pressure of 0.4 atm. Dimethyl ether decomposes as CH3OCH3gCH4g+COg+H2g  The rate constant of decomposition is 4.78×10-3 min-1. Calculate the ratio to initial rate of diffusion of rate of diffusion after 4.5 hour of initiation of decomposition. Assume the composition of gas present and composition of gas diffusing to be same.