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Chemistry is the scientific discipline involved with compounds composed of atoms, ie when a compound has more than one component, then they are divided into two classes, the electropositive and the electronegative components davy discovered nine new elements including the alkali metals by extracting them. Download free pdf for cbse class 9 science for exam preparation physical and chemical changes, tyndall effect, solutions, suspensions and colloids,.
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9th class chemistry subject is one of the most important subjects to study basically chemistry is an elective subject and this subject is studied by those aspirants.
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