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Question

Which of the following represents the lattice structure of Fe0.95O?

A
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B
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C
Both a. and b. are correct
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D
None of these
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Solution

The correct option is B
Fe2+ can be easily oxidised to Fe3+ readily. To maintain the electrical neutrality when this change occurs, we need to ensure that 2/3rd of the missing Fe2+ is replaced by Fe3+ as
3Fe2+=2Fe3+
The closed dots represent Fe2+ and in option b, it is clear that three of these are missing, which are being replaced with 2 Fe3+ ions.

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