Which one of the following minerals is found in pure form?
1). Iron
2). Copper
3). Bauxite
4). Manganese
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1. Nucleus of an atom consists of
2. The items amenable to detection by soft x-rays are
3. Which of the following has pH value 7?
4. A pair of contrasting characters controlling the same trait is called
5. The chemical name of ‘Common salt’ is
6. The main constituent of biogas is
7. The hottest part of the gas flame is known as
8. Threshold limit value of copper in the atmospheric air is
9. Which one of the following minerals is found in pure form?