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Name the type of preparation in which th...

Name the type of preparation in which the following examples are involved.
a) `As_2 O_3+3 H_2 S rarr As_2 S_3+3 H_2 O`
b) `SO_2+2 H_2 S rarr 2S+2 H_2 O`
c) `FeCl_3 +3 H_2 O rarrFe(OH)_3+3 HCl`

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a) Double decomposition b) Oxidation c) Hydrolysis
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