9th Class Chemistry English Medium Notes: 9th class chemistry notes, past papers, mcqs, short questions, guess paper, urdu notes, scheme and pattern.
9th Class Chemistry Notes of Chapter 2 MCQs and Short Questions Cathode rays were discovered in last decade of nineteen century. The properties of cathode rays were determined and they led to the discovery of electron. Canal rays were discovered in 1886 by Goldstein . The properties of canal rays resulted in the discovery of […]
9th Class Chemistry Notes of Chapter 1 MCQs, Short Questions Chemistry is study of composition and properties of matter. It has different branches. Substances are classified into elements and compounds. Elements consist of only one type of atoms. Compounds are formed by chemical combination of atoms of the elements in a fixed ratio. Mixtures are
