Chemistry Class 9 Chapter 1 mcqs Federal Board Fundamentals of Chemistry Important MCQs FBISE 9th Class MCQs 1. There are———–known elements. A. 101 B. 109 C. 118 D. 126 ANSWER.C 2. Atoms or groups of atoms with unpaired electrons are known ……….. A.compounds B.mixture C.molecules D.free radicals ANSWER.D Continue Reading Free radicals 3. A gas contains ————-moleculesChemistry Class 9 Chapter 1 Important MCQs Federal Board