A. It must be testable in order to be found true or false.
Answer:
RbOH
Explanation:
For this question, we have to remember what is the definition of a base. A base is a compound that has the <u>ability to produce hydroxyl ions</u>
, so:

With this in mind we can write the <u>reaction for each substance:</u>




The only compound that fits with the definition is
, so this is our <u>base</u>.
I hope it helps!
well none its made from iron nut i would go with c. a solution sorry if im wrong tell me in comments
MgF2 is <span>Magnesium fluoride
hope this helps!</span>
I think its density is 850kg/m^3