9th Class Chemistry Chapter 7 Test: Free Acid Base Chemistry Practice Paper

This 9th class chemistry chapter 7 test is an original ExamPaperDesk practice paper for Chapter 7, Acid Base Chemistry. Every question is printed in both English and Urdu, so English medium and Urdu medium students can use the same paper. It carries 36 marks: 10 multiple-choice questions with a bubble sheet, 10 short questions of which you attempt any eight, and 2 detailed questions. An answer key for the MCQs is given at the end.

Before you attempt it, revise from the Class 9 Chemistry Chapter 7 textbook PDF. The Class 9 Chemistry section of ExamPaperDesk is organised into notes, test papers, online papers, guess papers, past papers and textbook PDFs, and you can already browse our Class 9 Chemistry notes and textbook PDFs.

How to Use This Chapter 7 Test

Print the paper or open it on your phone, close your book and attempt all three sections in one sitting, as you would in an exam. Fill in the bubble sheet for Section A, then check your MCQs against the answer key on the last page. For the short and detailed questions, compare your answers with the chapter in your textbook and note any topic you need to revise again.

Download the 9th Class Chemistry Chapter 7 Test PDF

What the Chapter 7 Test Covers: Acid Base Chemistry

The paper is set across the whole of Chapter 7 rather than one exercise, so it is a fair check of whether the chapter is finished. Questions are drawn from:

• Arrhenius, Bronsted-Lowry and Lewis definitions of acids and bases.
• Conjugate acid-base pairs.
• Properties and uses of common acids, bases and salts.
• The pH scale, and the relationship between pH and hydrogen ion concentration.
• Neutralisation, titration and the choice of indicator.
• Salts, their preparation, and the difference between acidic, basic and neutral salts.

Facts You Need Before Attempting It

Most of the marks in Acid Base Chemistry hang on a small number of statements being exactly right:

• An acid donates a proton and a base accepts one, under the Bronsted-Lowry definition.
• pH below 7 is acidic, 7 is neutral and above 7 is basic; each unit is a tenfold change in hydrogen ion concentration.
• Neutralisation of an acid by a base produces a salt and water.

Where Marks Go Missing in This Chapter

• Confusing an acid with its conjugate base.
• Treating the pH scale as linear rather than logarithmic.
• Forgetting that neutralisation produces water as well as a salt.

Frequently Asked Questions

What does the pH scale measure?

The concentration of hydrogen ions in a solution. Each whole number represents a tenfold change, so pH 3 is ten times more acidic than pH 4 and a hundred times more acidic than pH 5.

Is the answer key included?

An answer key for the multiple-choice section is printed at the end of the paper. The written sections should be marked against your textbook and the solved chapter notes.

Related Class 9 Chemistry Resources

Continue with Chapter 6 test and Chapter 8 test. Everything for the subject is collected on the Class 9 Chemistry page, including the solved chapter notes and the rest of the Class 9 Chemistry test papers.