Do all atoms only have one oxidation state

Compare these two waves : a. the blue wave has a higher pitch, but the orange wave is louder. b.the blue and orange waves have the same volume, but the blue wave has a higher pitch. c.the blue and orange waves have the same pitch, but the blue wave is louder. d.the orange wave has a higher pitch, but the blue wave is louder.

How many atoms of oxygen are contained in 160 grams of n2o3

What are the spectator ions in 2h+ + so42- + ca2+ + 2r → caso4 + 2h+ + 21?