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

26) To dissolve 3.3 gm of certain metal in 110 mL of 1N H₂SO₄, find the equivalent mass of metal:

27) What volume of 2N and 5N H₂SO₄ should be mixed so that the resultant solution of 1 L has N = 3?

28) 10 gm HCl is dissolved in 250 mL of its aqueous solution. If density of the solution is 1.2 gm⁄mL, then molality of the solution would be:

29) CH₃COOH exists as a dimer in benzene. 1.2 gm of the acid was dissolved and the volume was made upto 1 L by benzene. What is the formality?