English
Karnataka Board PUCPUC Science 2nd PUC Class 12

A reaction is first order in A and second order in B. How is the rate affected on increasing the concentration of B three times?

Advertisements
Advertisements

Questions

A reaction is first order in A and second order in B. How is the rate affected on increasing the concentration of B three times?

A reaction is of first order with respect to reactant [A] and second order with regard to reactant [B]. What is the effect on rate of reaction when concentration of [B] three times?

Numerical
Advertisements

Solution

If the concentration of B is increased three times, then:

`-(d[R])/dt` = k[A][3B]2

= 9k[A][B]2

∴ The reaction rate will increase by a factor of 9.

shaalaa.com
  Is there an error in this question or solution?
2025-2026 (March) Official Board Paper

RELATED QUESTIONS

Write molecularity of the following reaction:

2NO(g)+O2(g)→2NO2(g)


For the first order thermal decomposition reaction, the following data were obtained:

Time / sec               Totalpressure / atm

0                              0.30

300                          0.50

Calculate the rate constant

(Given: log 2 = 0.301, log3 = 0.4771, log 4 = 0.6021)


For the hydrolysis of methyl acetate in aqueous solution, the following results were obtained :

t/s 0 30 60
[CH3COOCH3] / mol L–1 0.60 0.30 0.15

(i) Show that it follows pseudo first order reaction, as the concentration of water remains constant.

(ii) Calculate the average rate of reaction between the time interval 30 to 60 seconds.

(Given log 2 = 0.3010, log 4 = 0.6021)


From the rate expression for the following reaction, determine the order of reaction and the dimension of the rate constant.

\[\ce{H2O2_{( aq)} + 3I^-_{( aq)} + 2H^+ -> 2H2O_{(l)} + I^-_3}\] Rate = k[H2O2][I]


A reaction is second order with respect to a reactant. How is the rate of reaction affected if the concentration of the reactant is doubled?


In a reaction between A and B, the initial rate of reaction (r0) was measured for different initial concentrations of A and B as given below:

A/mol L−1 0.20 0.20 0.40
B/mol L−1 0.30 0.10 0.05
r0/mol L−1 s−1 5.07 × 10−5 5.07 × 10−5 1.43 × 10−4

What is the order of the reaction with respect to A and B?


For a reaction R ---> P, half-life (t1/2) is observed to be independent of the initial concentration of reactants. What is the order of reaction?


Write the principle behind the following methods of refining:

Hydraulic washing


Define the following term:

Pseudo first-order reaction


In any unimolecular reaction:

(i) only one reacting species is involved in the rate determining step.

(ii) the order and the molecularity of slowest step are equal to one.

(iii) the molecularity of the reaction is one and order is zero.

(iv) both molecularity and order of the reaction are one.


For a complex reaction:

(i) order of overall reaction is same as molecularity of the slowest step.

(ii) order of overall reaction is less than the molecularity of the slowest step.

(iii) order of overall reaction is greater than molecularity of the slowest step.

(iv) molecularity of the slowest step is never zero or non interger.


A catalyst in a reaction changes which of the following?


The role of a catalyst is to change


For a reaction 1/2 A ⇒ 2B, rate of disappearance of A is related 't o the appearance of B by the expression:


For reaction 2A + B → BC + D which of the following does not Express the reaction rates


The conversion of molecules A to B follow second order kinetics. If concentration of A is increased to three times, how will it affect the rate of formation of B?


Assertion (A): Order of reaction is applicable to elementary as well as complex reactions.

Reason (R): For a complex reaction, molecularity has no meaning.


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×