Which type of compound dissociates?

Write the complete balanced equation for the reaction between lead (iv) oxide (pbo2) and water (h2o).

Iknow the answer to 13 is b and 14 is d. i just need to know why the correct answers are correct

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 →