In which reaction is nitric acid acting as an oxidising agent ? A Cu+4HNO 3 Cu(NO 3 ) 2 +2H 2 O+2NO 2 B CuO+2HNO 3 Cu(NO 3 ) 2 +H 2 O C Na 2 CO 3 +2HNO 3 2NaNO 3 +H 2 O+CO 2 D NaOH+HNO 3 NaNO 3 +H 2 O

Coal i believe hope this

The air is going to come out because of the low pressure.

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.