31. Brass is made of
32. Bridgmanite is
33. Bronze is an alloy of
34. Percentage of carbon in steel ranges from
35. Copper is refined by
36. Froth floatation process to concentrate the minerals is applicable to
37. Chemical name of Gammaxane is
38. Epsom salt is used
39. The metal extracted from Bauxite is :
40. Among the following iron ores, the highest percentage of iron content is found in–
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