Which of the following is an iron ore ?
1). Bauxite
2). Magnetite
3). Lignite
4). Nitrite
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1. The purity of gold is expressed in carats. The purest form of goldis.
3. Normal rainwater has a pH level of
4. Malachite is an ore/mineral of
5. Black lung disease occurs in people working in
6. Intensive cultivation refers to
8. Which of the following is used as raw material for the manufacture of rayon?