Question

When oleum $\left(H_2{S}_2{O}_7\right)$ is completely hydrolyzed, then how many acidic hydrogens are present in the final product ?

• A. 2
• B. 3
• C. 4
• D. 7

Answer 1

The correct option is C 4

When oleum $\left(H_2{S}_2{O}_7\right)$ is completely hydrolyzed, then 4 acidic hydrogens are present in the final product.

$H_2{S}_2{O}_7+H_{2}O\to 2H_{2}S{O}_4$

Hence option C is correct.