classify the following as precipitation/ox-redux/bronsted-lowrey neutralization reactions.?

Question

It would be helpful If I knew how to figure this stuff out on my own.

Elemental copper and nitric acid form copper nitrate, nitrite, and water

copper nitrate and sodium hydroxide form copper hydroxide and sodium nitrate

copper hydroxide and sulfuric acid form copper sulfate and water

copper sulfate and sodium phosphate form copper phosphate and sodium sulfate

copper phosphate and hydrochloric acid form copper chloride and phosphoric acid

copper chloride and magnesium form copper and magnesium

also - "what is the purpose of each of these reactions" (i don't even understand what this question is asking!)

Answer 1

Oxidation