In the given equation
AsH₃(g) → As(s) + H₂(g)
This is a decomposition reaction in which Arsenic trihydride has decomposed into arsenic and hydrogen.
Redox reactions include a change in the oxidation state of the substrate. Loss of electrons or a rise in an element's oxidation state are both considered to be oxidation. Gaining electrons or lowering an object's or its atoms' oxidation state are both considered reductions. Combination, decomposition, displacement, and combustion reactions are the most frequent oxidation-reduction (redox) processes.
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