Are the stones in ring 1 and 2 are the same or different substances

stones in ring #1
density
5.92g/cm3
color
no color
hardness
8.5
melting point
2759 degrees celsius
not soluble in water

stones in ring #2
density
3.52g/cm3
no color
hardness
10.0
melting point
3547 degrees celsius
not soluble in water

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.