Engineering Materials
Smelting is the process of

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

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Engineering Materials
Inconel contains

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

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