NTA Abhyas NEET2020ChemistryGeneral Principles and Processes of Isolation of MetalsPractice

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

Options

AII, III in haematite and II in magnetite
BII, III in haematite and III in magnetite
CIII in haematite and II, III in magnetite
DII in haematite and II, III in magnetite

Correct answer

C. III in haematite and II, III in magnetite

Step-by-step solution

Iron is in +3 oxidation state in Haematite and +2 and +3 states in Magnetite. Haematite: F e 2 O 3 : 2 x + 3 × ( - 2 ) = 0 x = 3 Magnetite: F e 2 O 4 [an equimolar mixture of FeO and F e 2 O 3 ] F e O : x - 2 = 0 x = 2 F e 2 O 3 : x = 3

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