Which of the following statements is true about gas particles? The space between them is very small. They repel each other with a strong force. They collide to increase their net kinetic energy. The attractive force between them is very weak.

Particle exchange energy though elastic collision , hope this .

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.

Answer the air near the ground cools to its dew point

Ithink it's the third answer