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Question
Identify the formula of lanthanoid oxide formed when lanthanoid (Ln) is burnt in oxygen.
Options
Ln2O3
LnO2
Ln2O
LnO
MCQ
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Solution
Ln2O3
Explanation:
∵ Ln forms Ln3+ ions; they form Ln2O3 when it is burnt in oxygen.
\[\ce{4Ln + 3O2 -> 2Ln2O3}\]
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Properties of Lanthanoids
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