Question

Which of the following acts as pickling agent?

• A. $HNO_{3}$
• B. $HCl$
• C. $H_{2}SO_{4}$
• D. $HNO_{2}$

Answer 1

Answer: (C)

$H_{2}SO_{4}$

Answer 2

To remove the oxide film on metallic sheet, the sheet is dipped in $H_{2}SO_{4}$solution and then washed with water. This is known as pickling. $H_{2}SO_{4}$ is used for cleansing metals before electroplating, enameling, galvanising etc