Chapter 5, States and phases of matter. Free Chemistry notes are available for the first-year class.
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You can get the full chapter in a single PDF without a watermark here.
Chapter-5 Lec-1 Class 11 Notes
Class 11, Chapter 05, Lecture 01 Notes. (Intro + Properties of gases)
Chapter-5 Lec-2 Class 11 Notes
Class 11, Chapter 05, Lecture 02 Notes.(Ideal GAS equation)
Chapter-5 Lec-3 Class 11 Notes