21) A solution is prepared by mixing 10 mL of ethanol with 120 mL of methanol. What is the volume percentage of ethanol?

22) What is the weight by volume percentage of a solution in which 7.5 gm of KCl is dissolved in 100 mL of the solution?

23) 0.56 gm KOH is present in 100 mL of the solution. What is the normality?

24) Find the number of milli-equivalent of H₂SO₄ present in 50 mL of N⁄20 H₂SO₄:

25) To prepare 600 mL of 2N solution of NH₄OH, what volume of 10N NH₄OH is required?