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How do you bring about the following conversions:

i. Lanthanoid oxides to lanthanoid hydroxides? 

ii. Lanthanoid oxides to lanthanoid carbonates?

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i. Reaction with water, converts lanthanoid oxides to insoluble lanthanoid hydroxides.

Ln2O3 + 3H2O → 2Ln(OH)3

ii. Reaction with CO2 converts lanthanoid oxides to lanthanoid carbonates.

Ln2O3 + 3CO2 → Ln2(CO3)3

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