(c). A mixture contains two elements or two compounds or an element and a compound.
https://www.tiwariacademy.com/ncert-solutions-class-9-science-curiosity-chapter-2/
A mixture is made up of (a) two or more elements. (b) two or more compounds. (c) both (a) and (b). (d) none of these.
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The correct answer is:(c) both (a) and (b)
A mixture can be made up of two or more elements (e.g., a mixture of oxygen and nitrogen gases) or two or more compounds (e.g., a mixture of water and alcohol). It can also contain both elements and compounds together.
https://www.tiwariacademy.com/ncert-solutions/class-9/science/chapter-2/