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Hydrogen gas has

A. a very sweet smell

B. a very pungent smell

C. an irritating smell

D. no smell at all

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  2. A non-metal which is a good conductor of electricity is
  3. A mixture of naphthalene and sand is separated by
  4. The substance preserved under water is
  5. ________ is left behind after distillation of petroleum.
  6. One method by which the components of air can be separated is
  7. Coke is a substance obtained
  8. Even as early as 3000 BC glass was known to the
  9. The number of neutrons in the nucleus of an atom of mass A and atomic number Z is given by
  10. Which of the following is a communicable disease caused by viruses?
  11. Which of the following is not a characteristic of potable water?
  12. The best specimen for drinking purposes is
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  14. The form of carbon used in decolourising sugar solution is
  15. Proteins are polymerisation products of
  16. Boiler scales' contain
  17. Which of the following is not an alloy of copper?
  18. Galvanised iron sheets are protected from rusting due to the presence of a layer of
  19. Reduction involves
  20. The foul odour of gasoline is due to
  21. The earliest name given to nitrogen was
  22. The term 'nucleons' apples to
  23. Suspended impurities in water are effectively removed by
  24. Which of the following biology laboratory?
  25. Which one of the following is not radioactive?
  26. The carbon cycle ensures that
  27. Which of the following process involves removal of the elements of water?
  28. Which of the following elements is not required for the healthy growth of plants?
  29. In the common soda-acid fire extinguisher, the fire is put out by
  30. The raw materials used in the manufacture of cement are