Pyrolusite is a/an
Not an ore
Pyrolusite is MnO2.
A common metal which is highly resistant to corrosion is: (a) iron (b) cuprite (c) pyrolusite (d) haematite
The major ore fo aluminium is known as: (a) cinnabar (b) calamine (c) bauxite (d) pyrolusite
Four equal charges Q are placed at the four corners of a square of side 'a' each. Work done in removing a charge −Q from its centre to infinity is: