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12th Chemistry weekly Test -1 ( Chemical Kinetics )

St. Britto Hr. Sec. School - Madurai

12th Chemistry weekly Test -1 ( Chemical Kinetics )-Aug 2020

Time : 1.30 Hours

Part - A

Multiple Choice Question - Answer All Question

The value of rate constant of a pseudo first order reaction________________

Independent on the concentration of reactants present in small amount
Depends on the concentration of reactants present in excess
Independent of the concentration of reactants
Depends only on temperature.

Which of the following statement is not correct?

Molecularity of a reaction cannot be fractional
Molecularity of a reaction cannot be more than three
Molecularity of a reaction can be zero
Molecularity is assigned for each elementary step of mechanism.

For a reaction Rate = kacetone[]32 then unit of rate constant and rate of reaction respectively is

(mol L^-1 S^-1),(mol^1/2L^1/2S-1)
(mol^-1/2L^1/2s^-1),(mol L^-1s^-1)
(mol^1/2L^1/2s^-1),(molL^-1s^-1)
(molLs^-1),(mol^1/2L^1/2s)

Concentration is expressed in?

\(\frac { number\ of\ moles/litre }{ time\ in\ sec } \)
\(\frac { time\ in\ sec }{ number\ of\ moles/litre } \)
\(\frac { number\ of\ moles/litre }{ volume } \)
\(\frac { volume }{ number\ of\ moles/litre } \)

The half life period of a radioactive element is 140 days. After 560 days , 1 g of element will be reduced to

\(\left( \cfrac { 1 }{ 2 } \right) g\)
\(\left( \cfrac { 1 }{ 4 } \right) g\)
\(\left( \cfrac { 1 }{ 8 } \right) g\)
\(\left( \cfrac { 1 }{ 16 } \right) g\)

Among the following graphs showing variation of rate constant with temperature (T) for a reaction, the one that exhibits Arrhenius behavior over the entire temperature range is

both (b) and (c)

The unit of zero order rate constant is

litre mol^-1 sec^-1
mol litre^-1 sec^-1
sec^-1
litre² sec^-1

What would be the activation energy of a reaction when the temperature is increased from 27^oC to 37^oC?
534 kJ mol^-1

53.4 kJ mol^-1

5.34 kJ mol^-1

None of these
The rate constant of a reaction is 5.8X10^-2. The order of the reaction is
First order

zero order

Second order

Third order

For a first order reaction A \(\longrightarrow \) product with initial concentration x mol L^-1 , has a half life period of 2.5 hours .
For the same reaction with initial concentration \(\left( \frac { x }{ 2 } \right) \) mol L^-1 the half life is

(2.5 x 2) hours
\(\left( \frac { 2.5 }{ 2 } \right) \)hours
2.5 hours
Without knowing the rate constant, t_1/2 cannot be determined from the given data

The minimum energy that all colliding molecules must possess so as to make the collisions more effective and successful is_____________

activation energy
colliding energy
threshold energy
kinetic energy

Part - B

Generic 2 - Answer All Question

Describe the graphical representation of first order reaction.
Derive integrated rate law for a zero order reaction A\(\longrightarrow \) product

Why is instantaneous rate preferred over average rate?

The reaction A + 2B ⟶ C obeys the rate equation. Rate = \(K{ \left[ A \right] }^{ \frac { 1 }{ 2 } }{ \left[ B \right] }^{ \frac { 3 }{ 2 } }\) What is the order of the reaction?

Explain the effect of catalyst on reaction rate with an example

Define rate law and rate constant

Part - C

Generic 3 - Answer All Question

Explain pseudo first order reaction with an example

Explain briefly the collision theory of bimolecular reactions

For a reaction x+y+z\(\longrightarrow \) productsthe rate law is given by ratek =k[x]^3/2[y]^1/2 what is the overall order of the reaction and what is the order of the reaction with respect to z.

Write Arrhenius equation and explains the terms involved
The decomposition of Cl₂O₇ at 500K in the gas phase to Cl₂ and O₂ is a first order reaction. After 1 minute at 500K, the pressure of Cl₂O₇ falls from 0.08 to 0.04 atm. Calculate the rate constant in s^-1

The rate of formation of a dimer in a second order reaction is 7.5 X 10-³mol L^-1 s^-1monomer concentration. Calculate the rate constant.

Part - D

Generic 5 - Answer All Question

The time for half change in a first order decomposition of a substance A is 60 seconds. Calculate the rate constant. How much of A will be left after 180 seconds?

A zero order reaction is 20% complete in 20 minutes. Calculate the value of the rate constant. In what time will the reaction be 80% complete?

From the following data, show that the decomposition of hydrogen peroxide is a reaction of the first order:

t(min) 0 10 20

V(ml) 46.1 29.8 19.3

Where t is the time in minutes and V is the volume of standard KMnO₄ solution required for titrating the same volume of the reaction mixture.
The rate constant for a first order reaction is 1.54x 10^-3 s-1. Calculate its half life time.

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