Permanent hardness of water, due to sulphates of the metal, can be destroyed by the use of

A. Sulphonates

B. Zeolites

C. Nitrates

D. None of these

You can do it
  1. Glass is made from the mixture of
  2. The fastest acting enzyme in the biological kingdom is
  3. The speed of light with the rise in the temperature of the medium
  4. Polythene is industrially prepared by the polymerisation of
  5. The location and energy of an electron in an atom can be specified by
  6. What is the unit for measuring the pitch or frequency of sound ?
  7. Earth's seasons are caused by which of the following?
  8. The chemial name of Uria is
  9. Pollination by birds is called
  10. The smallest functional and structural unit of kidney is called as
  11. Which of the following is the lightest metal ?
  12. Which of the following parts of the sun is easily visible only during a total solar eclipse?
  13. The major ingredient of leather is
  14. Which of the following is most likely to cause a rise in the average temperature of earth's atmosphere…
  15. One fathom is equal to
  16. The solar eclipse occurs when
  17. Which of the following elements is non-radioactive?
  18. Which of the following is commonly called a polyamide ?
  19. The marine animal called dugong which is vulnerable to extinction is a/an
  20. The metal used in storage batteries
  21. The intencity of Earthquakes is measured on
  22. The oxide of Nitrogen used in medicine as anaesthetic is
  23. Liquefied Petroleum gas (LPG) consists of mainly
  24. In an atomic nucleus, neutrons and protons are held together by
  25. Permanent hardness of water can be removed by adding
  26. The most important ore of Aluminium is
  27. The element present in the largest amount in rocks and minerals is
  28. Rust is
  29. Carbon tetrachloride fire extinguisher should not be used in closed room because it produces poisonous…
  30. The hardest substance available on earth is