51. The colour of iron rust is . . . . . . . .
52. What is the structure of nichrome, which is an alloy?
53. . . . . . . . . the compound is used as a drying agent.
54. Which is the purest form of iron?
55. Muscovite, Pegmatite and Biotite are ores of:
56. Which of the following is not a non-ferrous metallic mineral?
57. The symbol used for Magnesium is:
58. Rust needs three components to occur i.e. . . . . . . . .
59. Which is the second most abundant element found in the earth's crust?
60. Which of the following causes damage to bridges, iron rust and all items made of metals?
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