Which among the following coal contains 90 per cent of carbon?
1). Anthracite
2). Bitumen
3). Lignite
4). Peat
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4. Which of the following measures will not increase a nation's wealth?
5. Which one of the following elements is used in the manufacture of safety matches?
6. What is the most common salt in sea water ?
7. When there are two electrons in the same orbital they have:
8. If water smells bad, then that odour can be removed by adding