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Permanent hardness of water can be removed by adding

A. Potassium Permanganate

B. Bleaching Powder

C. Chlorine

D. Washing Soda

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  1. Which of the following elements is obtained from sea weeds ?
  2. Which of the following parts of the sun is easily visible only during a total solar eclipse?
  3. The major ingredient of leather is
  4. Bromine is
  5. Which of the following characters is not shown by hydrogen
  6. Lightening cause rainfall because
  7. The Panda belongs to the same family as that of
  8. The solar eclipse occurs when
  9. Which of the following is in liquid form at room temperature ?
  10. Which of the following is most likely to cause a rise in the average temperature of earth's atmosphere…
  11. The formula of Plaster of Paris is
  12. According to Daltons atomic theory the smallest particle which can exist independently is
  13. Which of the following is the lightest metal ?
  14. Brass gets discoloured in air due to the presence of which gas in air
  15. Permanent hardness of water can be removed by adding
  16. In a certain electronic circuit the output is positive if input 1 is positive and input 2 is zero. If…
  17. The property of a substance to absorb moisture from the air on exposure is called
  18. Rust is
  19. The recent atomic weight scale is based on
  20. The removal of top soil by water or wind is called
  21. In an atomic nucleus, neutrons and protons are held together by
  22. Which of the following elements is non-radioactive?
  23. The location and energy of an electron in an atom can be specified by
  24. Pollination by birds is called
  25. Water has maximum density at
  26. The element present in the largest amount in rocks and minerals is
  27. The fastest acting enzyme in the biological kingdom is
  28. The type of glass used in making prisms and lenses is
  29. The speed of light with the rise in the temperature of the medium
  30. The marine animal called dugong which is vulnerable to extinction is a/an