Question

Which of the following is not an ore of iron?
A.Hematite
B.Limonite
C.Cassiterite
D.Magnetite

Answer 1

Hint:Various types of ores are found in our earth crust. From these ores, metal is extracted by mining. As metals are reactive elements, they are found generally in combined states. For example sulphide ore are those ore in which metal reacts with sulphur to form the compound in earth crust. Similarly halide ore are those which metal like silver, aluminium and potassium react with halogen to form compounds in earth crust.

Complete answer:
Metal is the element which tends to form a positive ion. The various compounds of metals which occur in the earth crust and are obtained by mining are called minerals. The mineral from which a metal can be profitably and easily extracted is called an ore. The undesirable impurities present in an ore are called gangue or matrix. Oxygen is the most abundant element in earth crust and aluminium is the most abundant metal in the earth crust.
Some common oxide ore are as follow: \[{\text{F}}{{\text{e}}_2}{{\text{O}}_3}\] Hematite, \[{\text{A}}{{\text{l}}_2}{{\text{O}}_3}.2{{\text{H}}_2}{\text{O}}\] Bauxite, \[{\text{FeO}}.{\text{C}}{{\text{r}}_2}{{\text{O}}_3}\] Chromites, \[{\text{F}}{{\text{e}}_3}{{\text{O}}_4}\] Magnetite, \[{\text{F}}{{\text{e}}_2}{{\text{O}}_3}.3{{\text{H}}_2}{\text{O}}\] Limonite, \[{\text{Sn}}{{\text{O}}_2}\] Cassiterite, \[{\text{C}}{{\text{u}}_2}{\text{O}}\] Cuprite, etc.
Some common sulphide ore are as follow: Zinc blende ore Sphalerite \[{\text{ZnS}}\] , Cinnabar \[{\text{HgS}}\] , Silver glance or Argentite \[{\text{A}}{{\text{g}}_2}{\text{S}}\] , Copper pyrites \[{\text{CuFe}}{{\text{S}}_2}\] ,etc.
Some common Halide ore are as follow: Rock salt \[{\text{NaCl}}\] , Horn silver \[{\text{AgCl}}\] , Cryolite \[{\text{Al}}{{\text{F}}_3}.3{\text{NaF}}\] , Sylvine \[{\text{KCl}}\] ,etc.
Some common Carbonate ore as follow: Magnesite \[{\text{MgC}}{{\text{O}}_3}\] , Limestone \[{\text{CaC}}{{\text{O}}_3}\] , Calamine \[{\text{ZnC}}{{\text{O}}_3}\] , Malachite \[{\text{CuC}}{{\text{O}}_3}.{\text{Cu}}{\left( {{\text{OH}}} \right)_2}\] , Siderite \[{\text{FeC}}{{\text{O}}_3}\] ,etc.

Thus, the correct option is B.

Note:
The extraction of metal from its ore is completed as per the concentration of the ore, conversion of concentrated ore into oxide, reduction of metal and refining of metal. Pyrometallurgy involves extraction of metal using high temperature and electrometallurgy involves extraction of metal from its ore by using electricity.