a) Why is FeO (s) not formed in stoichiometric composition?
b) Why does table salt some times appear yellow in color ?
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a) In FeOcrystals some Fe2+ cations are replaced by Fe3+ ions. Two Fe3+ ions replaces two Fe2+ ions to make up for the loss of positive charge. Due to this there is less amount of metal as compared to stoichiometric proportion.
b) Yellow colour in NaCI is due to metal excess defect due to which unpaired electrons occupy anionic sites, known as F-centres. These electrons absorb energy from the visible region for the excitation which makes crystalappear yellow.
b) Yellow colour in NaCI is due to metal excess defect due to which unpaired electrons occupy anionic sites, known as F-centres. These electrons absorb energy from the visible region for the excitation which makes crystalappear yellow.
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Answer:
:
A) Why is FeO (s) not formed in stoichiometric composition?
b) Why does table salt some times appear yellow in colour ?
Explanation
a) In FeOcrystals some Fe2+ cations are replaced by Fe3+ ions. Two Fe3+ ions replaces two Fe2+ ions to make up for the loss of positive charge. Due to this there is less amount of metal as compared to stoichiometric proportion.
b) Yellow colour in NaCI is due to metal excess defect due to which unpaired electrons occupy anionic sites, known as F-centres. These electrons absorb energy from the visible region for the excitation which makes crystalappear yellow.
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