Give a reaction which indicates dehydration property of con. `H_2SO_4`

Sulphuric acid is an important chemical in chemical industry. a) write any two uses of H_(2)SO_(4) b) Write an example for the dehydrating property of H_(2)SO_(4)

Calculate the oxidation number of 's' in H_2SO_4 ?

A list of reactions of sulphuric acid are given below. Zn + H_2SO_4 rarr ZnSO_4 + 2H_2O + SO_2 . 2C_2H_5OH + H_2SO_4 rarr C_2H_5-O-C_2H_5 + H_2O . 2NaOH + H_2SO_4 rarr Na_2SO_4 + 2H_2O . HCOOH + H_2SO_4 rarr H_2O + CO . 3H_2S + H_2SO_4 rarr 4H_2O + 4S . 2P + 5H_2SO_4 rarr 2H_3PO_4 + 2H_2O + 5SO_2 .Classify the reactions Into 3 sets based on the following properties of H_2SO_4 :- Oxidising property.

Assign oxidation number S in H_2SO_4

Phthalic acid reacts with resorcinol in the presence of concentrated H_2SO_4 to give