Which of the following segments are correct and which incorrect and justify your answer. 1) In a solution HCl that has pH=2, we add an amount of NaOH and a solution with pH>7 (25°C) eventuates.

2) If we add water in vinegar, the pH will decrease.

3) A aqueous solution Ca(OH)2 has pH=13. If we volatilise an amount of water, the pH will increase.

4) In a solution HNO3 with pH=1, we add swarf of iron and the pH increases.​

How is electrolysis most commonly used to produce an energy source? a - splitting water molecules produces oxygen, which organisms breathe to fuel their bodies. b - splitting water molecules produces hydrogen gas, which is used to power machines through hydrogen fuel cells. c - splitting carbon dioxide molecules produces coal, a form of carbon that can be burned to produce heat. d - splitting carbon dioxide molecules produces natural gas, which can be burned to generate electricity in power plants.