51. Which one of the following mineral does not contain oxygen ?
52. Which mineral is the ore of aluminium ?
53. Which of the following is a metallic ore ?
54. Magnalium is an alloy of
55. Magnetite is
56. In which of the following states maximum iron ore is found ?
57. Food cans are coated with tin and not with zinc because
58. Cinnabar is an ore/mineral of
59. The percentage of carbon in cast iron is :
60. Brass is a solution of molten copper in
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