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Q.

The principal ore of iron is

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a

 iron pyrites

b

copper pyrites

c

spathic iron 

d

 haematite

answer is A.

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Detailed Solution

The principal iron resource is hematite. Iron [III] oxide is its scientific name, and its chemical formula is Fe2O3. The other ores are spathic iron ore, magnetite, and iron pyrites.

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