The most likely characteristic of an acid that requires a special container is that it is corrosive. Corrosive means that it can dissolve other solid substances.
Slippery is one characteristic of a base. ;)
It will expand, because the neon atoms will move more quickly and get farther apart.
steel
An ionic solute requires a very strong polar solvent such as water in which to dissolve.
When a fire is lit in a sealed container it is very likely to cause an explosion because of the build up of internal pressure from smoke.
Acceptable
The likely word is "characteristic" (a trait, or typical).
It depends on the context or criteria being considered. Characteristics can vary greatly between countries, ranging from cultural traits, economic indicators, political systems, or geographic features. It is important to specify the type of characteristic in order to determine which country is most likely to possess it.
Income
Scars on its leg
The Boy Least Likely To Christmas Special was created in 2010.
noise pollution
I most likely corresponds to the chain's drive pitch or gauge or another special characteristic of that specific chain. First figure out who makes the chain, then consult a guide to their markings, usually available on their website.
A dumpster.
Speed
Oh yea mr krabs
Yes