17) 4 gm NaOH is present in 100 mL of its aqueous solution. What is the molarity?

18) The solution of H₂SO₄ contains 80% by mass. Specific gravity of solution is 1.71 gm⁄cc. Find its molarity:

19) To neutralize 20 mL NaOH, the volume if 1M HNO₃ is:

20) What is the weight percentage of NaCl solution in which 20 gm NaCl is dissolved in 60 gm of water?

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