9th Class Chemistry Notes Chapter 2 MCQs PDF - Atomic Structure

These are the multiple choice questions for Unit 2, Atomic Structure, from the new 9th class Chemistry book followed by the Punjab boards. The textbook exercise MCQs come first, then a longer set of additional MCQs arranged topic by topic, and the answer key sits at the end of the file.

• Class: 9th (Matric Part 1)
• Subject: Chemistry, English Medium
• Unit 2: Atomic Structure
• Question type: Multiple choice questions
• Total MCQs: 50, followed by an answer key table
• Syllabus: New PECTAA syllabus for Punjab Boards, sessions 2025-26 and 2026-27
• Format: PDF, ready to read or print

Topics the questions are drawn from:

• Isotopes and their natural abundance, including carbon-13, carbon-14 and uranium-235
• Isotopes used in medicine and dating, such as iodine-131 and carbon-14
• Masses of the proton, neutron and electron in amu
• Heavy water and how it differs from ordinary water
• Working out relative atomic mass from the abundances of two isotopes

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