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Ishita Das posted an Question

December 13, 2020 • 19:42 pm

30 points

IIT JAM
Geology (GG)

Black soil is black in colour due to presence of

Black soil is black in colour due to presence of A Compounds of iron and aluminium B Titaniferous magnetite C Compounds of iron and lead

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Rahul kumar

Answer: Compounds of iron and Aluminium Black soils are black in colour due to the presence of iron, aluminium compounds and humus.
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Both A and B is the answer. I was searching a reason for B being the answer. Thanks for clearing!!!
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Saurabh 1 Best Answer

Most probable answer has to be (B) Titaniferous magnetite. These are also black sometimes due to organic compounds of iron and aluminum and some soluble humus (dead and decayed plants which produces anaerobic condition in subsurface).
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Both A and B is the answer. I was searching a reason for B being the answer. Thanks for clearing!!!
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That's why i have written that Also they can have black colour due to organic compounds of Al and Fe.. So in case of MSQ, Both A and B will be answer but if one asks this in single mcq question then B would be best suited answer.
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Sajan sarthak

Soil Texture: Black cotton soil (regur soil) is highly argillaceous i.e. clayey. It is deep and impermeable and thus has high water retention capacity. Soil Colour: These soils are black in colour due to the presence of iron, aluminium compounds and humus ....so answer should be Iron and argillaceous material/alluminium
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