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 ...

CBSE 9th Assertion Reason Questions: The Central Board of Secondary Education (CBSE) Class 9 exams 2025 are around the corner and it's time for students to revise and prepare all the questions. One ...

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 ...