Which among the following coal contains 90 per cent of carbon?
1). Anthracite
2). Bitumen
3). Lignite
4). Peat
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1. The iron ore which contains 72% of iron is :
3. The substance most commonly used as a food preservative is
4. The temperature of oxy-acetylene flame is around
5. For what is Radiocarbon dating technique used?
7. The value of Avogadro Number is
8. Which one of the following pairs is NOT correctly matched?
9. A powerful eye irritant present in smog is
10. Silver halides are used in photographic plates because they are