Describe the commerical preparation of `KMnO_(4)` from pyrolusite ore

Describe a method of preparation of ozone.

Describe the preparation of Ozone.

Write steps involved in the preparation of KMnO_(4) .

Describe the Siemen’s method preparation of ozone.

Name two important ores of iron. Describe the principle of extraction of iron from an important ore. How does iron react with dilute and concentrate nitriacid separately ?

Indicate the steps in the preparation of K_2Cr_2O_7 from chromite ore.

Describe the preparation of potassium dichromate from iron chromite ore.

Describe the Siemen ' s method of preparation of Ozone. How does it react with PbS.