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a
oxide ores of iron are more abundant
b
aluminium is the major component of many igneous minerals like mica and clay
c
aluminium is the most abundant element in the earth,s crust.
d
siderite is an ore of copper
answer is A.
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Detailed Solution
Aluminium is the third most abundant element but most abundant metal in the earth's crust and siderite (FeCO3) is an ore of iron, not of copper. Other statements are true.