Starting from the best quality of iron ore, which one of the following is the correct sequence of the iron ore based on the contents of pure iron?

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Q: 26 (NDA-II/2008)
Starting from the best quality of iron ore, which one of the following is the correct sequence of the iron ore based on the contents of pure iron?

question_subject: 

Science

question_exam: 

NDA-II

stats: 

0,16,37,16,24,7,6

keywords: 

{'iron ore': [4, 0, 2, 5], 'pure iron': [0, 0, 1, 1], 'magnetite': [0, 0, 1, 0], 'hematite': [0, 0, 1, 0], 'limonite': [0, 0, 2, 1], 'siderite': [0, 0, 1, 0], 'contents': [0, 0, 2, 0]}

The correct answer is option 1: Magnetite - Hematite - Limonite - Siderite.

Iron ore is a mineral substance which, when heated in the presence of a reductant, yields metallic iron (Fe). The quality of iron ore can vary based on the content of pure iron it contains.

Magnetite is considered to be the best quality of iron ore due to its high iron content. It has the formula Fe3O4 and contains about 72% iron. It is a black or brownish-black mineral with a metallic luster.

Hematite is the next in line in terms of iron ore quality. It has the chemical formula Fe2O3 and contains about 70% iron. It is a reddish-black mineral with a metallic luster.

Limonite is a lower quality iron ore compared to magnetite and hematite. It has the formula FeO(OH)·nH2O and contains around 60% iron. It is a yellowish-brown mineral with a dull luster.

Siderite is the lowest quality iron ore among these options. It has the formula FeCO3 and contains around 48% iron. It is a greyish or yellowish mineral with a dull