Question

In the Contact process, sulphur trioxide is not converted to sulphuric acid by reacting it with water. Instead a two-step procedure is used. The equations for the two steps involved are:

${SO}_x+H_2{SO}_4\to H_2{S}_2{O}_y{H}_2{S}_2{O}_7+H_{2}O\to 2H_2{SO}_4$

Find the value of x and y :

• A. $x=2,y=5$
• B. $x=3,y=5$
• C. $x=2,y=7$
• D. $x=3,y=7$

Answer 1

Answer: (D)

$x=3,y=7$

The balanced reactions are shown below:

${SO}_3+H_2{SO}_4\to H_2{S}_2{O}_7{H}_2{S}_2{O}_7+H_{2}O\to 2H_2{SO}_4$

X=3 and Y=7
Option D is correct.