This 9th class chemistry chapter 8 test is an original ExamPaperDesk practice paper for Chapter 8, Periodic Table and Periodicity. 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 8 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 8 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 8 Test PDF
What the Chapter 8 Test Covers: Periodic Table and Periodicity
The paper is set across the whole of Chapter 8 rather than one exercise, so it is a fair check of whether the chapter is finished. Questions are drawn from:
- Mendeleev periodic law and the modern periodic law, and the difference between them.
- The structure of the modern periodic table: periods, groups and blocks.
- Atomic radius and ionic radius, and how they vary across a period and down a group.
- Ionisation energy and electron affinity trends, with explanations.
- Electronegativity and its trend.
- Why elements in the same group have similar chemical properties.
Facts You Need Before Attempting It
Most of the marks in Periodic Table and Periodicity hang on a small number of statements being exactly right:
- The modern periodic law arranges elements by increasing atomic number, not atomic mass as Mendeleev did.
- Atomic radius decreases across a period and increases down a group.
- Ionisation energy increases across a period and decreases down a group, which is the opposite of atomic radius.
Where Marks Go Missing in This Chapter
- Stating the modern periodic law in terms of atomic mass.
- Reversing the trend for ionisation energy and atomic radius.
- Confusing a group with a period.
Frequently Asked Questions
How does atomic radius change across a period?
It decreases. The nuclear charge rises while electrons are added to the same shell, so the stronger pull draws the shell closer to the nucleus.
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 7 test and Chapter 9 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.