Question

Write the chemical equation for the following?

Manganese dioxide heated with Aluminum.

Answer 1

• When Manganese dioxide $\left({\mathrm{MnO}}_2\right)$is heated with an Aluminum $\left(\mathrm{Al}\right)$ displacement of Manganese $\left(\mathrm{Mn}\right)$ occurs.
• Since, Aluminium is more reactive than Manganese, it is able to displace Manganese from Manganese dioxide.
• Here, Manganese dioxide is reduced to$\left(\mathrm{Mn}\right)$.
• Therefore, Aluminium acts as the reducing agent.
• The reaction is as follows:

$\underset{\left(\mathrm{Manganese}\mathrm{dioxide}\right)}{3{\mathrm{MnO}}_2\left(\mathrm{s}\right)}+4\mathrm{Al}\left(\mathrm{s}\right)\stackrel{\mathrm{Heat}}{\to }\underset{\left(\mathrm{Aluminium}\mathrm{oxide}\right)}{2{\mathrm{Al}}_2{\mathrm{O}}_3\left(\mathrm{s}\right)}+3\mathrm{Mn}\left(\mathrm{s}\right)$