Ronit, a class 8 student took 20 mL of dilute HCl in four different flasks. He added 10 mL of pure water to flask I, 20 mL of pure water to flask II, 20 mL of solution of dilute HCl to flask IV. pH of the solution will not change in
AFlask I
BFlask II
CFlask III
DFlask IV.