If a definite volume of '20 vol' `H_(2)O_(2)` solution is diluted such that the volume of diluted solution becomes double than that of original volume, then
i) the volume strength of diluted solution becomes '40 vol'
ii) the molarity of solution becomes half of its initial molarity
iii) the molarity of the solution becomes half of its initial molality
iv) the maximum amount of `O_2` gas obtainable from the solution remains the same.