Engineering Materials
Smelting is the process of

Removing the impurities like clay, sand etc. from the iron ore by washing with water
Expelling moisture, carbon dioxide, sulphur and arsenic from the iron ore by heating in shallow kilns
All of these
Reducing the ore with carbon in the presence of a flux

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Engineering Materials
Inconel contains

68% nickel, 29% copper and 3% other constituents
80% nickel, 14% chromium and 6% iron
65% nickel, 15% chromium and 20% iron
80% nickel and 20% chromium

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