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Name the method of preparation in which the following examples are involved.1. AS2O3 + 3H2S → AS2S3 + 3H2O

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Name the method of preparation in which the following examples are involved.

1. AS2O3 + 3H2S → AS2S3 + 3H2O

2. SO2 + 2H2S → 2S + 2H2O

3. FeCl3 + 3H2O → Fe(OH)3 + 3HCl

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1. Double decomposition 

2. Oxidation 

3. Hydrolysis

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