Metal a reacts slowly with cold water, while metal b reacts vigorously with cold water. metal c does not react with cold water or hot water, but does react with dilute acid. metal d reacts with hot water, but not cold water. the activity series for these metals is: (most reactive to least reactive)
a. b > a > d > c
b. a > b > c > d
c. a > b > d > c
d. b > a > c > d

Ithink this is what you meant. the temperature at which a liquid begins to boil is called the boiling point. the boiling point of water is 212°f or 100°c.  and at that point will start to turn into steam (gas)

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.