9th Class Chemistry English Medium Notes: 9th class chemistry notes, past papers, mcqs, short questions, guess paper, urdu notes, scheme and pattern.
English Medium Notes of 9th class Chemistry chapter 7 and 8 MCQs and short questions Unit 7 Oxidation is addition of oxygen or removal of hydrogen or loss of electrons by an element and as a result oxidation number increases. Reduction is addition of hydrogen or removal of oxygen or gain of electrons by an […]
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Chapter 6 notes of 9th class chemistry MCQs and Short Questions Solution is a homogeneous mixture of two or more substances. Aqueous solution is formed by dissolving substances in water. The component which is lesser in quantity is called solute and the component in greater quantity is called solvent. A solution containing less amount of
Chemistry Notes of unit 5 9th class MCQs and Short Questions Gases diffuse very rapidly. Diffusion is mixing up of a gas throughout a space or other gases. Effusion is escaping of a gas molecule through a fine hole into an evacuated space. Gases exert pressure. The SI unit of pressure is Nm-2 which is
9th Class chemistry notes of unit 4 MCQs and Short Questions Atoms of different elements react to attain noble gas configuration, which is stable one. Chemical bonds may be formed by complete transfer of electrons (ionic); mutual sharing (covalent) or by donation from an atom(coordinate or dative covalent). Metals have the tendency to lose electrons
9th Class notes of chemistry chapter 3 MCQs and Short Questions In nineteenth century attempts were made to arrange elements in a systematic manner. Dobereiner arranged elements in a group of three called triads. Newlands arranged elements in groups of eight like musical notes. Mendeleev constructed Periodic Table containing periods and columns, by arranging elements
