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Graphite and sillimanite are
1 Refractory minerals
2 Ferrous minerals
3 Base minerals
4 None of these
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Which of the following is not a neutral oxide? 1 Carbon monoxide 2 Sulphur dioxide 3 Nitric oxide 4 Water
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The process by which an organic compound breaks down into simpler compounds on heating to high temperature is known as 1 Armatisation 2 Polymerization 3 Pyrolysis 4 Reduction
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The wavelength of X-ray is of order of 1 1 cm 2 1m 3 1 Angstrom 4 10 micron
plants in a food chain are actually the
2 Answers Competitive Exams, Stenographer,
Bell metal is an alloy of 1 Brass an nickel 2 Zinc and copper 3 Tin and copper 4 None of these
The Purest form of water can be obtained from:- I) a deep tube well II) a running stream III) a hot water spring IV) a heavy shower of rain
Which of the following metals was first discovered by man? 1 Bronze 2 Silver 3 Iron 4 Copper
Biological Sciences 
