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Suspended impurities in water are effectively removed by

A. adding milk of lime

B. filtering through sand

C. adding filter alum

D. chlorination

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  1. Which of the following act a both u oxidising and reducing agent?
  2. A metal which exhibits allotropy is
  3. Rooms in places infected by plague are disinfected using
  4. Heated saw dust catches fire when a drop of concentrated nitric acid is added to it. This is due to
  5. ________ is left behind after distillation of petroleum.
  6. Which of the following cannot be used for the preparation of soap?
  7. In addition to nitric acid, another acid which may render iron passive is
  8. Which or the following is not a constituent or gun powder?
  9. Clark's method for removal of temporary hardness in water uses
  10. Which of the following is not a food material?
  11. A non-metal which is a good conductor of electricity is
  12. The compound of iron used in the manufacture of blue-black ink is
  13. A substance used as a fire-extinguisher under the trade name of Pyrene is
  14. A non-material kind of pollution is
  15. Deficiency of iron causes
  16. Proteins are polymerisation products of
  17. Which of the following is used as a food preservative?
  18. Alum is used
  19. The gas which has a faint sweet odour is
  20. Which is the 'odd man' in the following?
  21. Vinegar is the trade name for
  22. Mortar contains cement and sand in the ratio of
  23. Annealing of glass is carried out by
  24. Reduction involves
  25. The non-metal which has a shining appearance is
  26. Nitrous oxide used as anaesthetic is usually mixed with
  27. Which of the following types of water gives lather easily with soap?
  28. Which of the following is called 'the King of Chemicals?
  29. The compound or nitrogen used in dry cells is
  30. The value of Avogadro Number is