Question

1. what is the disinfectant with the least killing power but that has the longest lasting residual?

a. chlorine
b. ozone
c. chlorine dioxide
d. chloramines

1. what is the active ingredient in household bleach?

a. calcium hypochlorite
b. calcium hydroxide
c. sodium hypochlorite
d. sodium hydroxide

Explanation:

For question 5: Chlorine, ozone, and chlorine dioxide have stronger immediate killing power, while chloramines have weaker disinfectant efficacy but persist much longer in water to provide extended residual protection.
For question 6: Household bleach typically consists of an aqueous solution of sodium hypochlorite, which is the component responsible for its bleaching and disinfecting properties. Calcium hypochlorite is more common in pool chlorine, while calcium hydroxide and sodium hydroxide are not the active bleaching ingredients.

Answer:

1. d. chloramines
2. c. sodium hypochlorite