As SO4²⁻ changes to SO3²⁻, it is said that sulphur is being reduced since its oxidation number:
Decreases as electrons are gained.
Decreases as electrons are lost.
Increases as electrons are lost.
Increases as electrons are gained.
When NO2 acts as a reducing agent, a possible product is:
N2O4.
N2O.
N2O5.
NO.
What is an appropriate shorthand notation for the galvanic cell based on the reaction below?
Fe(s) + Cu(NO3)2 (aq) → Fe(NO3)2 (aq) + Cu(s).
Cu(s) / Cu²⁺(aq) // Fe²⁺(aq) / Fe(s).
Fe(s) / NO3⁻(aq) // NO3⁻(aq) / Cu(s).
Cu(s) / Cu(NO3)2 (aq) // Fe(NO3)2 (aq) / Fe (s).
Fe(s) / Fe²⁺(aq) // Cu²⁺(aq) / Cu(s).
