Please answer c question

In this reaction n2o4(g)→2no2(g) what changes in color would you expect as pressure is increased at a constant temperature

1. combine iron and copper (ii) sulfate solution. (hint: iron will form the iron (iii) ion) fe + cuso4 → 2. combine lead (ii) nitrate and potassium iodide solutions. pb(no3)2+ kl → 3. combine magnesium metal and hydrochloric acid solution. mg + hcl → 4. electrolysis (splitting) of water. h2o → 5. burning magnesium. mg + o2 →

As changes in energy levels of electrons increase, the frequencies of atomic line spectra they emit