National Science Olympiad Forum By SOF Olympiad Trainer - Page 48

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Subject :NSO    Class : Class 4

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Subject :NSO    Class : Class 7

Ans 1:

Class : Class 7
OPTION (i) IS CORRECT BECAUSE ACCORDING TO SOME STUDIE SILK IS MORE POWERFUL

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Class : Class 7

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Subject :NSO    Class : Class 7

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Subject :NSO    Class : Class 9

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Subject :NSO    Class : Class 8

Which of the following statements is not true about destructive distillation of coal?

A It is carried out by heating coal strongly to 1000°C in the absence of air.
B The residue left behind after the process is a good fuel and burns without smoke.
C The gas evolved during the process is used as a fuel in many industries situated near the coal processing plants.
D None of these.


Coal gas doesn't have many uses in present times. However, coal gas was used as a fuel earlier and also used to light street lamps in London. Thus, Option C ought to be the correct answer, but I would be grateful if the solution to the question was provided.

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Subject :NSO    Class : Class 4

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Subject :NSO    Class : Class 9

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Subject :NSO    Class : Class 6

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Subject :NSO    Class : Class 7

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Subject :NSO    Class : Class 1

Ans 1:

Class : Class 1
C

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