MEDIUMMCQ SINGLEJEE Mains ChemistryInorganic ChemistryMetallurgyPrevious Year Questions
The correct order of the abundance of the elements in earth’s crust is (AIMPT 2011)
A.O > Si > Al > Fe
B.Fe > Al > Si > O
C.Si > Fe > Al > O
D.Al > Fe > O > Si✓ Correct
Explanation
The correct order of the abundance of the elements in earth’s crust is O > Si > Al > Fe. 28. Which one of the following is a mineral of iron? (AIPMT 2012) (a) Malachite (b) Cassiterite (c) Pyrolusite (d) Magnetite Magnetite is one of the main ores of iron. Its chemical composition is 3 4 Fe O . Ferroso ferric oxide is an oxide of iron and magnetite exists naturally in this form with the chemical composition 2 3 FeO.Fe O . Therefore, the correct answer is option (d) magnetite
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