Explanation: A pure substance is one which is made up of only one kind of atoms or molecules. They have the same composition throughout. 2.Rusting of an article made up of iron is called (a) corrosion ...

NCERT Class 9 Science Book PDF: The National Council of Educational Research and Training (NCERT) has revised the Class 9 Science NCERT Book with the deletion of certain chapters and topics to reduce ...

CBSE Class 9 Matter in Our Surroundings Notes: Check CBSE Class 9 Science notes for Chapter 1 - Matter in Our Surroundings. These notes are prepared to help students with quick revision for class ...