Explain`H_2SO_4` acid is dibasic. Draw structure.

Draw lewis structure of H_2S

Draw structure of HClO_4 .

Draw structure of H_3PO_4 .

Explain Ostwald process for manufacturing nitric acid. Draw structure of nitric acid and write its uses also.

Draw the structures of XeO_4

Draw the structure of XeOF_2

Write method of preparation of H_2SO_4 acid by Contact process.