For the reaction A + B → C + D, the initial rate for different reactions and initial concentration of reactants are given below: S.No Initial concentration Initial rate A mol L - 1 B mol L - 1 mol L - 1 s - 1 1 1 . 0 1 . 0 2 × 10 - 3 2 2 . 0 1 . 0 4 × 10 - 3 3 4 . 0 1 . 0 8 × 10 - 3 4 1 . 0 2 . 0 2 × 10 - 3 5 1 . 0 4 . 0 2 × 10 - 3 Write the rate law equation.

For the given reaction, rate = k [ A ] x [ B ] y . After substituting the values of initial rates and initial concentrations, the value of x and y can be calculated. Then ( x + y ) will give the order of the reaction. For experiment ( i ) 2 . 0 × 10 - 3 = [ 1 . 0 ] x [ 1 . 0 ] y For experiment ( ii ) 4 . 0 × 10 - 3 = [ 2 . 0 ] x [ 1 . 0 ] y For experiment ( iii ) 8 . 0 × 10 - 3 = [ 4 . 0 ] x [ 1 . 0 ] y For experiment ( iv ) 2 . 0 × 10 - 3 = [ 1 . 0 ] x [ 2 . 0 ] y For experiment ( v ) 2 . 0 × 10 - 3 = [ 1 . 0 ] x [ 4 . 0 ] y Determination of x . In order to get the value of x , divide equation (2) by (1) 4 . 0 × 10 - 3 2 . 0 × 10 − 3 = [ 2 . 0 ] x [ 1 . 0 ] y [ 1 . 0 ] x [ 1 . 0 ] y 2 1 = 2 x x = 1 Determination of y . In order to get the value of y , divide equation (4) by (1) 2 . 0 × 10 - 3 2 . 0 × 10 - 3 = [ 1 . 0 ] x [ 2 . 0 ] y [ 1 . 0 ] x [ 1 . 0 ] y y = 0 The overall order of reaction = 1 + 0 = 1 The rate law (also known as the rate equation) for a chemical reaction is an expression that provides a relationship between the rate of the reaction and the concentrations of the reactants participating in it. Rate law, r α A 1 B 0 r α A 1 r = k A 1

E M B I B E

Chemistry Crash Course (Based on Revised Syllabus-2023)>Chapter 9 - Solved Chemistry Paper-1>Exercise

Exercise

Author:Embibe Experts

Embibe Experts Chemistry Solutions for Exercise

Simple step-by-step solutions to Exercise questions of Solved Chemistry Paper-1 from Chemistry Crash Course (Based on Revised Syllabus-2023). Also get 3D topic explainers, cheat sheets, and unlimited doubts solving on EMBIBE.

Questions from Exercise with Hints & Solutions

MEDIUM

12th ICSE

IMPORTANT

Chemistry Crash Course (Based on Revised Syllabus-2023)>Chapter 9 - Solved Chemistry Paper-1>Exercise>Q 1

Graph of half life of zero-order reaction and initial concentration of reactant is a _____ (straight line/parabola).

EASY

12th ICSE

IMPORTANT

Chemistry Crash Course (Based on Revised Syllabus-2023)>Chapter 9 - Solved Chemistry Paper-1>Exercise>Q 8

When a coordination compound ${CoCl}_{3} . 6 {NH}_{3}$ is mixed with ${AgNO}_{3}$ , three moles of $AgCl$ are precipitated per mole of the compound. Write the structural formula and IUPAC name of the coordination compound.

EASY

12th ICSE

IMPORTANT

Chemistry Crash Course (Based on Revised Syllabus-2023)>Chapter 9 - Solved Chemistry Paper-1>Exercise>Q 9

Using the valence bond approach, predict the shape, hybridisation and magnetic behaviour of $[Ni {(CO)}_{4}]$ . (at. no. of $Ni = 28$ ).

EASY

12th ICSE

IMPORTANT

Chemistry Crash Course (Based on Revised Syllabus-2023)>Chapter 9 - Solved Chemistry Paper-1>Exercise>Q 19

For the reaction A + B → C + D, the initial rate for different reactions and initial concentration of reactants are given below:

S.No	Initial concentration		Initial rate
S.No	$[A] mol L^{- 1}$	$[B] mol L^{- 1}$	$mol L^{- 1} s^{- 1}$
$1$	$1.0$	$1.0$	$2 \times 10^{- 3}$
$2$	$2.0$	$1.0$	$4 \times 10^{- 3}$
$3$	$4.0$	$1.0$	$8 \times 10^{- 3}$
4	$1.0$	$2.0$	$2 \times 10^{- 3}$
5	$1.0$	$4.0$	$2 \times 10^{- 3}$

Write the rate law equation.

EASY

12th ICSE

IMPORTANT

Chemistry Crash Course (Based on Revised Syllabus-2023)>Chapter 9 - Solved Chemistry Paper-1>Exercise>Q 24

Show that for a first order reaction the time required to complete $75 %$ of reaction is about $2$ times more than that required to complete $50 %$ of the reaction.

EASY

12th ICSE

IMPORTANT

Chemistry Crash Course (Based on Revised Syllabus-2023)>Chapter 9 - Solved Chemistry Paper-1>Exercise>Q 28

Write the reaction of potassium dichromate with cold concentrated sulphuric acid.

EASY

12th ICSE

IMPORTANT

Chemistry Crash Course (Based on Revised Syllabus-2023)>Chapter 9 - Solved Chemistry Paper-1>Exercise>Q 29

What happens when potassium permanganate is reacted with hydrogen sulphide in an acidic medium?

EASY

12th ICSE