Redox & Electrochemistry

The oxidation number of S in $\mathrm{H}{}_2\mathrm{SO}{}_4$ is ...

An oxidation reaction is a reaction that ...

The oxidation number of Mn in $\mathrm{KMnO}{}_4$ is ...

In a voltaic cell, oxidation occurs at the ...

A reduction reaction is a reaction ...

A substance that oxidises another substance is called ...

The oxidation number of Cr in the $\mathrm{Cr}{}_2\mathrm{O}{}_7{}^{2-}$ ion is ...

In the reaction $\mathrm{Zn}+\mathrm{CuSO}{}_4\to \mathrm{ZnSO}{}_4+\mathrm{Cu}$, the oxidising agent is ...

Given $E^{\circ }$ $\mathrm{Zn}{}^{2+}/\mathrm{Zn}=-0,76\text{V}$ and $\mathrm{Cu}{}^{2+}/\mathrm{Cu}=+0,34\text{V}$. The standard cell potential of $\mathrm{Zn}|\mathrm{Zn}{}^{2+}||\mathrm{Cu}{}^{2+}|\mathrm{Cu}$ is ...

In the reaction $\mathrm{MnO}{}_2+4\mathrm{HCl}\to \mathrm{MnCl}{}_2+\mathrm{Cl}{}_2+2\mathrm{H}{}_2\mathrm{O}$, the reducing agent is ...

According to Faraday's first law, the mass of substance deposited on an electrode is proportional to ...

During the electrolysis of a $\mathrm{CuSO}{}_4$ solution with carbon electrodes, the gas formed at the anode is ...

The difference between a voltaic cell and an electrolytic cell is ...

Given $E^{\circ }$ $\mathrm{Ag}{}^{+}/\mathrm{Ag}=+0,80\text{V}$ and $\mathrm{Fe}{}^{2+}/\mathrm{Fe}=-0,44\text{V}$. The standard cell potential of the pair is ...

In the reaction $\mathrm{MnO}{}_4{}^{-}+\mathrm{C}{}_2\mathrm{O}{}_4{}^{2-}\to \mathrm{Mn}{}^{2+}+\mathrm{CO}{}_2$ in acidic medium, after balancing the number of electrons involved is ...

A current of $9,65\text{A}$ is passed through a $\mathrm{CuSO}{}_4$ solution for $1000\text{s}$. The mass of copper deposited at the cathode is ... ($A_r$ Cu $=63,5$; 1 F $=96500\text{C/mol}$)

Given $E^{\circ }$: $\mathrm{Zn}{}^{2+}/\mathrm{Zn}=-0,76\text{V}$, $\mathrm{Cu}{}^{2+}/\mathrm{Cu}=+0,34\text{V}$, $\mathrm{Ag}{}^{+}/\mathrm{Ag}=+0,80\text{V}$. The order of oxidising strength, strongest first, is ...

Electrolysis of a $\mathrm{Na}{}_2\mathrm{SO}{}_4$ solution with inert electrodes produces gas at both electrodes. The mole ratio of $\mathrm{H}{}_2$ at the cathode to $\mathrm{O}{}_2$ at the anode is ...

To protect an underground iron pipe from corrosion, magnesium metal is used. Magnesium acts as a ...

In the reaction $2\mathrm{KMnO}{}_4+16\mathrm{HCl}\to 2\mathrm{KCl}+2\mathrm{MnCl}{}_2+8\mathrm{H}{}_2\mathrm{O}+5\mathrm{Cl}{}_2$, the oxidation number of Mn changes from ...