31. Name the sodium compound which is used to permanently remove the hardness of water.
32. Which of the following is called Aurum?
33. The solution of is used to treat bee stings.
34. Permanent hardness of water can be removed by adding . . . . . . . .
35. Glass is attacked by which of the following?
36. For soldering is used . . . . . . . .
37. Which of the following will melt when placed on the palm?
38. MgO solution is . . . . . . . .
39. Washing soda contains . . . . . . . . molecules of water of crystallisation.
40. The chemical that is used to ripen mangoes is
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