Predicting redox reactions

The strongest reductant from the following list: Fe³⁺; Sn²⁺; H₂O; K⁺; Br^-; Au; Pb²⁺ is

• K⁺
• Fe³⁺
• Sn²⁺
• Au

The iron (II) ion, Fe²⁺(aq)

• can act as an oxidant but not a reductant
• can oxidise solid zinc and reduce liquid bromine
• can act as a reductant but not an oxidant
• will always be reduced to Fe(s) in redox reactions

Which statement is true of a reducing agent?

• It is oxidised as it gains electrons.

• It is oxidised as it loses electrons.

• It is reduced as it gains electrons.

• It is reduced as it loses electrons.

When a gas changes iron(III) oxide to iron(II) oxide, the gas is

• a combustible gas

• a reducing agent

• an inert gas

• an oxidising agent

Which gas is the strongest reducing agent?

• Br^-

• Cl^-

• F^-

• I^-

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

In a redox reaction, spectator ions...

• become oxidised

• become reduced

• remain unchanged

What is the reducing agent of this reaction?

2Al (s) + 6H⁺ (aq) → 2Al³⁺ (aq) + 3H₂ (g)

• H⁺

• Al³⁺

• Al

• H₂

What is the oxidizing agent of this reaction?

3Mg + N₂ → Mg₃N₂

• Mg

• N₂

• Mg₃N₂

• MgN

Which half-reaction correctly represents reduction reaction?

• Br^- + 2e^- −−−>Br₂
• Mn²⁺ + e^- −−−>Mn
• Ag⁺ + 2e^- −−−>Ag
• Cu²⁺ + 2e^- −−−>Cu

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which species undergoes a gain of electrons?
Zn_(s) + Mg²⁺_(aq) −−−> Zn²⁺_(aq) + Mg _(s)

• Zn
• Mg²⁺
  Fe²⁺
• Zn²⁺
• Mg

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2