MHT CET · Chemistry · General Principles and Processes of Isolation of Metals

Which of the following is not the mineral of iron?

A Limonite
B Magnetite
C Corundum
D Haematite

Verified Solution

Answer & Solution

Correct Answer

(C) Corundum

Step-by-step Solution

Detailed explanation

Key Idea Corundum is not a mineral of iron. It is a crystalline form of aluminium oxide typically containing traces of Fe, Ti, V and Cr. Limonite, magnetite and haematite are minerals of iron. Name and molecular formula of given minerals is given below:

Name	Mineral
Limonite	$F e (O H) . n H_{2} O$
Magnetite	$F e_{3} O_{4}$
Corundum	$A l_{2} O_{3}$
Haematite	$F e_{2} O_{3}$

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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