a. Choose the balanced equation for the following half-reaction: 2+ Fe(s) → Fe²+ (aq) OFe(s) → Fe²+ (aq) — 2e¯ © Fe(s) → Fe²+ (aq) + 3e¯ OFe(s) → Fe²+ (aq) + 2e¯ OFe(s) → Fe²+ (aq) + le¯ b. Choose the balanced equation for the following half-reaction: 2+ Co3+(aq) → Co®+ (aq) 2+ )e – Co3+ (aq) → Co+ (aq) e +Co3+ (aq) → Co+(aq) 3e +Co®+ (aq) → Co+(aq) 2e +Co®+(aq) →Co+ (aq) 3+ 2+ c. Choose the balanced equation for the following half-reaction: Se² (aq) → Se(s) Se² (aq) → 2Se(s) + 2e¯ 2Se²- (aq) → Se(s) + 2e¯ Se²- (aq) → Se(s) + e¯ O Se- (aq) → Se(s) + 2e¯ d. Choose the balanced equation for the following half-reaction: 2+ Fe²+ (aq) → Fe(s) 2+ De¯ — Fe²+ (aq) → Fe(s) 2+ 3e¯ + Fe²+ (aq) → Fe(s) e¯¯ + Fe²+ (aq) → Fe(s) 2e¯ + Fe²+ (aq) → Fe(s)
Oxidation reduction reaction (Redox reaction)
It can be defined as the chemical reaction in which simultaneously oxidation and reduction take place.
In this reaction one species is oxidized and another is reduced.
Oxidation : loss of electrons (oxidation number increases)
Reduction: gain of electrons (oxidation number decreases)
Oxidizing agent: oxidizing agent can be define as the substance which can cause the oxidation of another substance. It acts as an electron acceptor as a result it's oxidation state decreases.
Reducing agent: reducing agent can be define as the substances which can cause reduction of another substances. It acts as an electron donor as a result it's oxidation state increases.
When the reactant donates electrons during redox reaction it get Oxidised (oxidation number increased). But when the reactant accept electrons during redox reaction it get reduced (oxidation number decreased).
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