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Biogas is obtained during

A. decomposition of petrol

B. fermentation of animal and plant waste

C. destructive distillation of coal

D. electrolysis of water

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  3. Which of the following carbon compounds is used as a fire extinguisher?
  4. Which one of the following elements is alloyed with iron to produce steel which can resist high temperatures…
  5. Smelling salt contains
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  7. Clark's method for removal of temporary hardness in water uses
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  17. The scientist who synthesised the first organic compound (urea) in the laboratory was
  18. The compound used in photography is
  19. The artificial silk produced from cellulose is
  20. Which one of the following is used for dry cleaning?
  21. The gas which has a faint sweet odour is
  22. Consider the following statements: Hard water is not suitable for1) drinking2) washing clothes with…
  23. The formula for cane sugar is
  24. Apart from lead tetra-ethyl, the other compound used as antiknock is
  25. In photography, the compound or nitrogen used is
  26. Which of the following la a very good supporter of combustion?
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