Final answer:
The reaction between aqueous nitrate ion and solid arsenic trihydride producing solid arsenic and gaseous ammonia is a redox process and the balanced chemical equation is 2 NH4NO3(aq) + 3 AsH3(s) → 3 As(s) + 8 NH3(g) + H2O(l).
Step-by-step explanation:
The chemical equation for the reaction where aqueous nitrate ion reacts with solid arsenic trihydride (AsH3) and produces solid arsenic (As) and gaseous ammonia (NH3) can be represented as:
2 NH4NO3(aq) + 3 AsH3(s) → 3 As(s) + 8 NH3(g) + H2O(l)
This reaction is a redox process where the oxidation state of arsenic changes from -3 in arsenic trihydride to 0 in elemental arsenic, and the nitrogen in the nitrate ion changes from +5 to -3 in ammonia.