Integrated Rate Law for Zero and First Order Reactions

IMPORTANT

Integrated Rate Law for Zero and First Order Reactions: Overview

This Topic covers sub-topics such as First Order Reactions, Zero Order Reactions, Half Life Period for First Order Reactions, Methods of Determination of Order of Reactions and, Time-Concentration Graph for Zero Order Reactions

Important Questions on Integrated Rate Law for Zero and First Order Reactions

MEDIUM
IMPORTANT

What is the order of a reaction whose rate constant is 5 x 10-4 mol-1litre s-1?

HARD
IMPORTANT

Prove that the time required for 99.9% of a 1st order reaction is ten times the half life period.

HARD
IMPORTANT

A first order reaction is found to have a half-life of 1.15 × 104 s.

What will be the time required for completion of 99% of the reaction?

HARD
IMPORTANT

A first order reaction is 25% completed in 40 minutes. calculate the value of rate constant. In what time will the reaction be 80% completed?  Given: log 3=0.477, log 4=0.602.

MEDIUM
IMPORTANT

In a first order reaction AB, If K is the rate constant and initial concentration of the reactant A is 0.5 M then the half life is :

HARD
IMPORTANT

In 30 minutes, a first-order reaction is 50% complete. Calculate the amount of  time it took to complete 87.5 percent of the reaction.

HARD
IMPORTANT

For a reaction : 2Ag Bg + 3Cg, rate constant of disappearance of A is 10-3 M sec-1. If initially 2 M of A is taken then what will be concentration of C afterr 5 minutes?

HARD
IMPORTANT

For a chemical reaction, A+BProducts, the order is one with respect to each A and B. Value of x and y from the given data is :

Rate

Mol L-1S-1

A B
0.1 0.20 M 0.05 M
0.4 x 0.05 M
0.8 0.40 M y

 

EASY
IMPORTANT

The initial concentration of a zero order reaction is decreased from 4 mol L-1 to 1 mol L-1. Time for half change

HARD
IMPORTANT

Select the correct statements out of I, II and III for a zero order reaction:

I. Quantity of the product formed is directly proportional to time.

III. If 50% reaction takes place in 100 minutes, 75% reaction will take place in 150 minutes.

III.Larger the initial concentration of the reactant, greater is the half-life period.

EASY
IMPORTANT

Define half-life period and average life. Derive relation between them.

EASY
IMPORTANT

Define half-life period. How is it related to the order of a reaction?

MEDIUM
IMPORTANT

Derive integrated rate equation for rate constant for a first order reactants. What would be units of the first order rate constant, if the concentration is expressed in moles per litre and time in seconds?

MEDIUM
IMPORTANT

Derive the equation for the rate constant of a first order reaction and show that the time required for the completion of half of the first order reaction is independent of initial concentration.

EASY
IMPORTANT

Show that for the reactions of first order, half-life period is independent of initial concentrations.

MEDIUM
IMPORTANT

Derive the relationship between rate constant and half-life period of a first order reaction.

HARD
IMPORTANT

The following data were obtained during the first order thermal decomposition of SO2Cl2 at a constant volume

SO2Cl2(g)SO2(g)+Cl2(g)

Experiment Time/s Total pressure/at m
1 0 0.4
2 100 0.7

Calculate the rate constant.

(Given: log4=0.6021,log2=0.3010)

HARD
IMPORTANT

A first order reaction takes 20 minutes for 25% decomposition. Calculate the time when 75% of the reaction will be completed. (Given: log2=0.3010,log3=0.4771,log4=0.6021)

HARD
IMPORTANT

The thermal decomposition of a compound is of first order. If 50% of the compound is decomposed in 120 minutes, how long will it take for 90% of the compound to decompose?

HARD
IMPORTANT

The rate constant of a first order reaction is 60 s-1. How much time it will take to reduce 75% of its original concentration?