In redox reactions, what happens to the reducing agent?
It is oxidised
It does not participate in the reaction and remains unchanged
It is reduced
Which of the following process involves the use of an oxidising agent?
Acidified potassium permanganate being used to form ethanoic acid from ethanol
Using carbon monoxide to obtain iron from iron ore in a blast furnace
Lithium aluminium hydride being used to change propanone into propan-2-ol
Which of the following reactions is an example of a redox process?
Black carbon powder burning in oxygen to form colourless carbon dioxide gas
Ethanol and a butanoic acid reacting together to form an ester
Magnesium metal displacing zinc from a solution of zinc sulfate
What is the equation for the redox reaction involving the following two ion-electron equations?
\[Zn(s) \rightarrow Zn^{2+}(aq)+2e^{-} \]
\[Ni^{2+}(aq)+2e^{-} \rightarrow Ni(s) \]
\[Zn(s)+Ni^{2+}(aq)+2e^{-} \rightarrow Zn^{2+}(aq)+Ni(s)+2e^{-}\]
\[Zn(s)+Ni^{2+}(aq) \rightarrow Zn^{2+}(aq)+Ni(s) \]
\[Ni(s)+Zn^{2+}(aq) \rightarrow Ni^{2+}(aq)+Zn(s) \]
What is added to complex ion-electron equations to balance the electrical charge?
Water molecules (H2O)
Hydrogen ions (H+)
Electrons (e-)
Which of the following is the correctly balanced ion-electron equation for the change \(S(s) \rightarrow H_{2}S(g) \)?
\[S(s)+H_{2}(g) \rightarrow H_{2}S(g) \]
\[S(s)+2H^{+}(aq)+2e^{-} \rightarrow H_{2}S(g) \]
\[S(s)+4H^{+}(aq)+ 2e^{-} \rightarrow H_{2}S(g)+H_{2}O(l)\]
Which of the following is the correctly balanced ion-electron equation for the change Br2 (l) giving BrO-(aq)?
\[Br_{2}(l)+2H_{2}O(l) \rightarrow 2BrO^{-}(aq)+4H^{+}(aq)+2e^{-}\]
\[Br_{2}(l)+H_{2}O(l) \rightarrow BrO^{-}(aq)+2H^{+}(aq)+e^{-}\]
\[Br_{2}(l)+2H_{2}O(l) \rightarrow 2BrO^{-}(aq)+2H^{+}(aq)+e^{-}\]
Which of the following is the correctly balanced ion-electron equation for the change ClO3- (aq) giving Cl2 (g)?
\[2ClO{_{3}}^{-}(aq)+12H^{+}(aq)+10e^{-} \rightarrow Cl_{2}(g)+6H_{2}O\]
\[ClO{_{3}}^{-}(aq)+6H^{+}(aq)+5e^{-} \rightarrow Cl_{2}(g)+3H_{2}O\]
\[2ClO{_{3}}^{-}(aq)+6H^{+}(aq)+4e^{-} \rightarrow Cl_{2}(g)+6H_{2}O\]
Which of the following is the correctly balanced ion-electron equation for the change XeO3 (s) giving Xe (g)?
\[XeO_{3}(s)+6H^{+}(aq)+6e^{-} \rightarrow 3Xe(g)+3H_{2}O\]
\[XeO_{3}(s)+6H^{+}(aq)+6e^{-} \rightarrow Xe(g)+3H_{2}O\]
\[XeO_{3}(s)+6H^{+}(aq) \rightarrow Xe(g)+3H_{2}O\]
Which of the following is the correctly balanced ion-electron equation for the change CrO42- (aq) giving Cr2O72- (aq)?
\[2CrO{_{4}}^{2-}(aq)+4H^{+}(aq)+2e^{-} \rightarrow Cr_{2}O{_{7}}^{2-}(aq)+2H_{2}O\]
\[CrO{_4{}}^{2-}(aq)+2H^{+} + 2e^{-} \rightarrow Cr_{2}O{_{7}}^{2-}(aq)+H_{2}O\]
\[2CrO{_{4}}^{2-}(aq)+2H^{+}(aq) \rightarrow Cr_{2}O{_{7}}^{2-}(aq)+H_{2}O\]