Which of the following acts as pickling agent ?

Options

A. `HNO_(3)`
B. `HCl`
C. `H_(2)SO_(4)`
D. `HNO_(2)`

Answer

C

Explanation

To remove the oxide film on metallic sheet the sheet is dipped in `H_(2)SO_(4)` solution and them washed with water. This is known as pickling. `H_(2)SO_(4)` is used for cleansing metals before electroplateing, enamling, galvanising etc.