Balmer series of emission spectrum is in visible region. what are the colours will it produce?

The rules of engagement (roe) working group is often used to (select all that apply.)

The name of the ion, s2-, is: sulfurous ion sulfide ion sulfur ion sulfate ion

Given sno2 + 2h2 - sn + 2h20 tin oxide reacts with hydrogen to produce tin and water. how many moles of sno2 are needed to produce 500.0 grams of sn?