Is starch produced when a leaf is kept in the dark why or why not?

Starch is not produced in the dark because light is the necessary element in photosynthesis, the way that plants make energy and produces starch.
That's why when we do experiments that test for starch, we must leave the plant in dark areas for 48 hours so that it can use up all the remaining starch before we test any variables.

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.