Problem 1
Iron loses its magnetic property at (a) boiling point (b) melting point (c) \(1000 \mathrm{~K}\) (d) curie point
Problem 2
The purest form of iron is (a) pig iron (b) wrought iron (c) red iron (d) steel
Problem 3
Which of the follwoing reaction occurs in the com. bustion zone of the blast furnace during the extractior of iron? (a) \(\mathrm{CO}_{2}+\mathrm{C} \longrightarrow 2 \mathrm{CO}\) (b) \(\mathrm{CaO}+\mathrm{SiO}_{2} \longrightarrow \mathrm{CaSiO}_{3}\) (c) \(\mathrm{C}+\mathrm{O}_{2} \longrightarrow \mathrm{CO}_{2}\) (d) \(\mathrm{FeO}+\mathrm{CO} \longrightarrow \mathrm{Fe}+\mathrm{CO}_{2}\)
Problem 4
Which of the following is used to reduce pure haematite to iron? (a) \(\mathrm{CO}\) (b) \(\mathrm{H}_{2} / \mathrm{Pd}\) (c) \(\mathrm{LiAlH}_{4}\) (d) \(\mathrm{H}_{2}\)
Problem 6
On igniting \(\mathrm{Fe}_{2} \mathrm{O}_{3}\) at 1673 (a) \(\mathrm{Fe}_{2} \mathrm{O}_{3}\) starts melting (b) \(\mathrm{FeO}\) is formed (c) metallic iron is formed (d) both (b) and (c)
Problem 7
Ferric iron forms a prussian blue coloured precipitate with \(\mathrm{K}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]\), due to the formation of (a) \(\mathrm{Fe}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]_{3}\) (b) \(\mathrm{K}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]\) (c) \(\mathrm{K}_{3}[\mathrm{Fe}(\mathrm{CN})]\) (d) \(\mathrm{Fe}(\mathrm{CNS})_{3}\)
Problem 8
Thermite is a mixture of (a) \(\mathrm{Zn}+\mathrm{CaCO}_{3}\) (b) \(\mathrm{MgO}+\mathrm{Al}\) (c) \(\mathrm{Fe}_{3} \mathrm{O}_{4}+\mathrm{Al}\) (d) \(\mathrm{Zn}+\mathrm{P}_{2} \mathrm{O}_{5}\)
Problem 9
Stainless steel vessels are made from steel containing (a) \(\mathrm{W}\) (b) \(\mathrm{Mn}\) (c) \(\mathrm{Cr}\) (d) \(\mathrm{Ni}\)
Problem 10
Cassiterite is concentrated by (a) hand picking (b) levigation (c) electromagnetic separation (d) Wilfley table method
Problem 11
Galena ore is concentrated by (a) gravity separation (b) froth flotation process (c) magnetic separation (d) roasting
