51. Tooth enamel is made up of which one of the following calcium compounds?
52. Which one of the following colours is supplied by Sodium Chromate?
53. Which one of the following metals is accessed in the native state?
54. A combustible gas is liberated when caustic soda solution is heated with
55. Chemically 'Plaster of Paris' is
56. Fill in the blanks using the correct option for the following statements from the given alternatives. On heating the . . . . . . . ., a plaster of Paris is obtained.
57. Which of the following compounds is used in gun powder?
58. . . . . . . . . is never found as a free element in nature.
59. The most abundant metal in the earth's crust is
60. Doctors, Artists and Sculptors use Calcium Sulphate which is popularly known as
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