Question

Why ${\mathrm{MnO}}_2$ is used in dry cell?

Answer 1

• ${\text{MnO}}_{\mathit{2}}$ is used in the dry cell because it acts as a depolariser.
• It's also employed because it creates moisture, which keeps the solution moist and enhances ionic mobility.
• Manganese dioxide ${\text{MnO}}_{\mathit{2}}$ is sometimes known as manganese oxide (IV). The breakdown of hydrogen peroxide can be catalyzed by this ionic molecule.
• Manganese (IV) oxide, with the formula ${\text{MnO}}_{\mathit{2}}$ is an inorganic compound.
• This blackish or brown solid is found naturally as the mineral pyrolusite, which is a manganese ore and a component of manganese nodules.
• ${\text{MnO}}_{\mathit{2}}$ is primarily used in dry-cell batteries such as alkaline and zinc-carbon batteries.
• ${\text{MnO}}_{\mathit{2}}$ is also used as a pigment and as a precursor to other manganese compounds like ${\mathrm{KMnO}}_4$.
• It is used in organic synthesis as a reagent, for example, in the oxidation of allylic alcohols.
• Furthermore, ${\text{MnO}}_{\mathit{2}}$ extends the life of a Leclanche dry cell battery by increasing the rate of hydrogen bubble removal in a Leclanche dry cell.
• ${\text{MnO}}_{\mathit{2}}$ is also used in dry-cell batteries such as alkaline and zinc-carbon batteries.
• ${\text{MnO}}_{\mathit{2}}$ is also a pigment and a precursor to other manganese compounds like ${\mathrm{KMnO}}_4$.
• It is used in organic synthesis as a reagent, for example, in the oxidation of allylic alcohols.
• Furthermore, it is used in battery cathode mixes and electronics. ${\text{MnO}}_{\mathit{2}}$ has the potential to be used in solid-state lithium-ion batteries for automobiles.
• ${\text{MnO}}_{\mathit{2}}$ is used as a catalyst and in ferromagnetic ferrites.
• A catalyst is a material that alters the chemical rate of a reaction without being consumed in the process.