Redox Reactions

Which oxidation state does Chromium exhibit in the $CrO_4^{2-}$ ion?

Identify the reducing agent in the reaction: $Mg + 2Ag^+ \rightarrow Mg^{2+} + 2Ag$

What is the oxidation state of Carbon in $CH_4$?

A substance that undergoes oxidation is also known as a/an:

In the chemical process shown in the diagram, the permanganate ion ($MnO_4^-$) is converted into the manganese(II) ion ($Mn^{2+}$) in an acidic medium. According to the electronic concept of redox reactions, which of the following statements is correct regarding the manganese atom?

When metallic Zinc reacts with Copper sulfate solution, the reaction is classified as a:

Which of the following molecules contains Nitrogen with an oxidation state of +3?

What is the oxidation state of Carbon in $CH_2Cl_2$?

In which of the following compounds does Nitrogen exhibit its highest possible oxidation state?

In the reaction $MnO_2 + 4HCl \rightarrow MnCl_2 + Cl_2 + 2H_2O$, the equivalent weight of $MnO_2$ (Molar mass = M) is:

What is the oxidation number of Carbon in the bicarbonate ion ($HCO_3^-$)?

The oxidation number of Oxygen in the superoxide ion ($O_2^-$) is:

In $K_2MnO_4$ (Potassium manganate), what is the oxidation number of Manganese?

What is the oxidation number of Nitrogen in $N_2O$ (Nitrous oxide)?

In Dichlorine heptoxide ($Cl_2O_7$), what is the oxidation state of Chlorine?

In the complex ion $[Cr(H_2O)_6]^{3+}$, what is the oxidation state of Chromium?

What is the oxidation number of Carbon in Sucrose ($C_{12}H_{22}O_{11}$)?

What is the oxidation state of Oxygen in $O_2F_2$?

Balance $MnO_4^- + Fe^{2+} + C_2O_4^{2-} + H^+ \rightarrow Mn^{2+} + Fe^{3+} + CO_2 + H_2O$ (where $Fe$ and $C_2O_4$ come from $FeC_2O_4$). What is the coefficient of $MnO_4^-$?

In the reaction $N_2H_4 + BrO_3^- \rightarrow N_2 + Br^-$, what is the oxidation number change for Nitrogen?

What is the oxidation state of Carbon in the carbonate ion ($CO_{3}^{2-}$)?

In the following half-reaction, what is the value of 'n'? $MnO_{4}^{-} + 8H^{+} + n e^{-} \rightarrow Mn^{2+} + 4H_{2}O$

Which of these is the correct oxidation state for Phosphorus in $PCl_{5}$?

What is the oxidation state of Nitrogen in $N_{2}O_{5}$?

In the reaction $2KMnO_{4} + 10FeSO_{4} + 8H_{2}SO_{4} \rightarrow K_{2}SO_{4} + 2MnSO_{4} + 5Fe_{2}(SO_{4})_{3} + 8H_{2}O$, what is the ratio of $KMnO_{4}$ to $FeSO_{4}$?

The diagram illustrates the conservation laws used during redox balancing. Which label represents the step where the number of electrons lost is made equal to the number of electrons gained?

When balancing $3ClO^{-} + 2CrO_{2}^{-} + 2OH^{-} \rightarrow 3Cl^{-} + 2CrO_{4}^{2-} + H_{2}O$, what is the coefficient of $OH^{-}$?

For the reaction $Cr_{2}O_{7}^{2-} + H_{2}S + H^{+} \rightarrow Cr^{3+} + S + H_{2}O$, what is the ratio of coefficients of $H_{2}S$ to $H^{+}$?

When the reaction $FeS_{2} + O_{2} \rightarrow Fe_{2}O_{3} + SO_{2}$ is balanced, what is the coefficient of $O_{2}$?

In the reaction $MnO_{4}^{-} + Mn^{2+} + H_{2}O \rightarrow MnO_{2} + H^{+}$, what is the coefficient of $MnO_{2}$ in the simplest balanced equation?

During the electrolysis of molten $NaCl$, which species is reduced at the cathode?

In the cell $Mg | Mg^{2+} || Ag^+ | Ag$, which electrode is the cathode?

Which of the following is true for an electrolytic cell?

When a cell reaction reaches equilibrium, the $E_{cell}$ becomes:

In a fuel cell, such as the Hydrogen-Oxygen fuel cell, what is the net reaction involved?

When an electrochemical cell reaches equilibrium, what is the value of the cell potential ($E_{cell}$)?

Identify the strongest oxidizing agent from the given standard reduction potentials: $X (+0.52\text{ V})$, $Y (-3.03\text{ V})$, $Z (-1.18\text{ V})$, $W (+1.33\text{ V})$.

Which of the following electrodes is a 'Metal-Insoluble Salt' electrode?

An electric current is passed through two electrolytic cells connected in series. Cell A contains $AgNO_3$ and Cell B contains $CuSO_4$. If $1.08\text{ g}$ of Silver is deposited in Cell A, what mass of Copper is deposited in Cell B? (Atomic masses: $Ag = 108, Cu = 63.5$)

In the process of corrosion of Iron, which of the following acts as the cathode?