31. Monazite is an ore of
32. Carbon, diamond and graphite are together called:
33. Potassium nitrate is used in
34. Permanent hardness of water may be removed by the addition of:
35. Soda water contains
36. The most important ore of aluminum is
37. Most soluble in water is:
38. Which of the following was to be discovered first in the chromospheres of the sun?
39. Which of the following is in liquid form at room temperature?
40. Sodium metal is kept under:
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