A container contains 20 L mixture in which there is 10% sulphuric acid. Find the quality of sulphuric acid to be added in it to make the solution to contain 25% sulphuric acid.
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 4 L.
Concentration of sulphuric acid in 20L = 10% of 20 = 2L.
Let the amount of sulphuric acid to be mixed be x.
= (2L + x)/(20 + x) = 1/4
On solving we get,
x = 4L