What is the color of $K_2MnO_4$?

Presence of $Cr$ in steel makes it

$A$ compound of mercury used in cosmetics,in Ayurvedic and Yunani medicines and known as vermilion is

The addition of metals like $Cr$,$Mn$,$W$ and $Ni$ to ordinary steel makes it

Describe the preparation of potassium permanganate. State its physical properties,structure,and uses. Discuss its chemical properties and provide chemical reactions demonstrating the oxidizing character of $KMnO_{4}$.

$FeSO_4 \cdot 7H_2O$ (Green Vitriol) salt on thermal decomposition does not produce