In the non-stoichiometric oxide Fe 0.93 O, the percentage of iron present as Fe 3+ ions is approximately:

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In the non-stoichiometric oxide Fe0.93O, the percentage of iron present as Fe3+ ions is approximately:

Answer: 15%.

A 7%
B 10%
C 15%
D 23%

Correct answer: C. 15%

Explanation: Charge balance: 2a + 3b = 2 with a + b = 0.93 gives b(Fe3+) = 0.14, so % Fe3+ = 0.14/0.93 x 100 = 15%.

The three cubic unit cells: Simple Cubic has atoms only at corners; Body-Centred adds one atom at the centre; Face-Centred adds one atom at the centre of each of the 6 faces, giving the highest packing efficiency.

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Explore the ordered world of crystalline solids: unit cells, packing, defects, and how structure determines electrical and magnetic properties.

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In the non-stoichiometric oxide Fe<sub>0.93</sub>O, the percentage of iron present as Fe<sup>3+</sup> ions is approximately:

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