3. Take vinegar, lemon juice, tap water in three separate glass beakers. Put chalk piece, pin, egg shell, leaves in three beakers. Note your observations how test the gas evolved in it.​

They are all full and don't need any more electrons in there outer shell.

You would be correct, boiling water does disinfect contamination.    the property of disinfecting means to kill  germs, bacteria and other pathogens or contamination  that might cause an infection or cause a person to become sickly. a couple methods of disinfecting are using soap, other cleaning supplies or by simply "boiling" the contaminate.  the reason why boiling water disinfects certain attributes is because some cells cannot survive the heat and pressure.

Ok so co(g) is not pronoused that. the only clue is that youpronouse it the oppisote way.