Metallurgy-extraction of iron ,alloy,corrosion

1.The chief ore of iron is.....

• haematite (Fe₂O₃)

• Magnetite (Fe₃O₄)

• Iron pyrite (FeS₂)

Using gravity separation method...............ore is concentrated.

• aluminium

• copper

• iron

• zinc

3.Roasting means......................

• heating in the presence of oxygen

• heating ion the absence of oxygen

• cooling

• galvanising

IRON ORE smelting process is takes place in.....................

• blast furnace

• ashing furnace

• calcination furnace

• tempering furnace

The charge consisting of roasted ore, coke and limestone in the ratio of ....................in smelting process of iron

• 8:4:1

• 1:4:8

• 4:8:1

• 1:8:4

Iron reacts with chlorine it gives.......................

• ferric chloride (FeCl₃)

• Ferric sulphate(FeSO₄)

• Ferric hydrpxide Fe(OH)₃

• Ferrous sulphide (FeS₂)

Iron(Fe) reacts with sulphuric acid (H2SO4)it gives.............

• Ferrous sulphate-FeSO₄

• Ferric chloride-FeCl₃

• Ferrous sulphide-FeS₂

• ferrous hydroxide-Fe(OH)₃

An .........is a homogeneous mixture of two or more metals or of one or more metals with certain non-metallic elements.

• alloy

• metals

• elements

• ore

An ..................... is a mixture of mercury with other metals

• amalgam

• ore

• mineral

• alloy

...................iron is used in preparing electromagnets

• pig iron

• steel

• wrought iron