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

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  5. Water has maximum density at
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  18. According to Daltons atomic theory the smallest particle which can exist independently is
  19. Lightening cause rainfall because
  20. In an atomic nucleus, neutrons and protons are held together by
  21. The smallest functional and structural unit of kidney is called as
  22. The type of glass used in making prisms and lenses is
  23. The most important ore of Aluminium is
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  26. Which of the following is in liquid form at room temperature ?
  27. Which of the following is the lightest metal ?
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  30. Permanent hardness of water can be removed by adding