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Helium is produced on commercial scale from

A. Air

B. Natural gas

C. Coke oven gas

D. None of these

Correct Answer : B.


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  3. Raw materials used for producing __________ cement does not contain iron oxide.
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  10. Production of one ton of cement requires about __________ tons of limestone.
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  14. Wood charcoal is used for decolouration of sugar, because it __________ the coloured materials.
  15. Solvent extracted oil
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  17. The function of gypsum addition during cement making is to
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  19. Fish contains about __________ percent oil.
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  24. __________ is a thermosetting plastic.
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