41. Where does the oxygen that keeps us alive come from?
42. In chemical terms, what are alums used for purifying water for drinking purposes ?
43. Brown stains in vessels and clothes indicate the presence of high quantities of ________ in water.
44. If water smells bad, then that odour can be removed by adding
45. Surface water is a better source of drinking water because it is poor in
46. Which one of the following acids is used in battery ?
47. Which of the following is the strongest base in aqueous solution ?
48. Which of the following acids serves as an electrolyte in a lead storage battery?
49. Which is known as carbolic acid?
50. Citric acid is present in free form in
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