Compound X has a Rf value of 0.25. How far will compound X have traveled from the origin when the eluent (solvent) front has traveled 40 mm

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)

there is none because earth is stationary and flat.

the correct answer is b. a strong acid completely dissociates to its ions when dissolved in water. completely dissociates to and ions. a is incorrect because does not fully ionize to and ions and some remain as the compound . c and d are incorrect because, and do not fall into the category of bronsted lowry acids. a bronsted lowry acid is a proton donor and since both molecules do not have a proton to donate they are not bronsted lowry acids. likewise,   if we use the lewis acid definition, they cannot be acids. a lewis acid is an electron pair acceptor. both and have a complete octet so can not accept any electrons which disqualifies them as acids.

the answer is a for sure mark brainliest i had got this right on usatestprep