JEE Main & Advanced Chemistry Organic Chemistry: Some Basic Principles & Techniques / कार्बनिक रसायन : कुछ मूलभूत सिद्धांत एवं तकन Question Bank Mock Test - General Principles Processes of Isolation of Elements

Oxidation states of the metal in the minerals haematite and magnetite, respectively, are

A) II, III in haematite and III in magnetite

B) II, III in haematite and II in magnetite

C) II in haematite and II, III in magnetite

D) III in the haematite and II, III in magnetite

Correct Answer: D

Solution :

[d]

(i) Haematite is \[F{{e}_{2}}{{O}_{3}}\] in which Fe is present in III oxidation state.

(ii) Magnetite \[(F{{e}_{3}}{{O}_{4}})\] is an equimolar mixture of \[FeO\] and\[F{{e}_{2}}{{O}_{3}}\].

Oxidation state of Fe in FeO is II.

Oxidation state of Fe in \[F{{e}_{2}}{{O}_{3}}\] is III.