I feel deeply indebted to all of you for giving such a tremendous response to the edition of the book. It will be my sincere endeavour to keep on serving you through new editions also.

Some main highlights of the present edition are:-

The present edition has been written as per the latest syllabus prescribed the CBSE level wise categorisation of illustrative examples and exercises has been done carefully large number of multiple choice questions MCQ fill in the blanks type questions very short answer type questions and the competition level questions are added at the end of each chapters, activities based upon the content have been given at the end of chapter.

All NCERT problems in the exercise have been solved in the section hints to NCERT and selected problems.

It is my sincere advice to the students that in each chapter first they should go to through the theory and concepts thoroughly, then they should attempt to solve the illustrated example without looking at their solutions student should consult the solution only when they are unable to solve on their own the exercise is given and the end of each section should be attempted at the time of revision of the chapter.

At the last i want to say that practice makes the man perfect so give your all attention and solve according to book and levels given.