## anonymous 4 years ago Assuming that the proposed reactants are mixed in stoichiometric ratios, and at moderate concentrations, which of the following is least likely to represent an observable (e.g., gas evolution or precipitation) reaction? A) H2S + Cu2+ + SO42- ? B) Ca2+ + 2 Cl- + 2 K+ + CO32- ? C) 2 Na+ + CO32- + 2 HC2N3O2 ? D) H2SO3 + Li+ + Cl- ? E) Pb2+ + 2 NO3- + 2 Na+ + 2 OH- ?

Tip: Superscript with ^ , subscript with _ Use $$to open 2. anonymous and$$ to close and you can do this: H$$_3$$O$$^+$$ Your choice options are a bit hard to see what they are intended to be, so while the question itself is clear, the options are not. Additionally you can use \rightarrow to do this: $$\rightarrow$$ I know it's been 15 hours since you posted this but if you still need an answer @jude90 then please reply back with a formatted set of choices so those who will try to answer will know what's going on :-) Native LaTeX code is one of the great features of this website, helps so much when writing chemical formulas or math symbols.