Question

Iron content in hematite and magnetite is _____ and ________ respectively.
1) $70\% ,72\% $
2) $68\% ,60\% $
3) $72\% ,60\% $
4) $60\% ,78\% $

Answer 1

Hint:Iron ores are basically rocking and minerals and from this metallic iron are extracted economically. The ores are usually very rich in iron oxides. They differ in color from dark grey to brown. And hematite and magnetite are usually high in iron ore.

Complete answer:
Iron ore is basically known as rocks or minerals from which metallic iron is extracted for commercial use. These minerals usually vary from dark grey to rusty red in color, and contain large amounts of iron oxides. Iron occurs in the form of some chemical compounds such as hematite, magnetite, siderite, limonite respectively. These are naturally found elements containing iron ores. These are then processed to extract the maximum amount of iron out of use for commercial purposes. Hematite is the mineral form of Iron(III) oxide $F{e_3}{O_2}$ whereas ​Magnetite is a mineral of form $F{e_3}{O_4}$. Hematite ore $F{e_2}{O_3}$ ​ has $70\% $ iron content. $F{e_3}{O_4}$ ​ is magnetite ore of $72\% $ iron content.

So here we have Option ‘1’ as the correct answer.

Note:
There are about 300 types of minerals containing iron ores. This varies from as low as 25% to as high as 80%. So basically minerals containing high amounts of ores are selected so that they will be beneficial for commercial purposes.