Water found in streams, depressions, and from the ground must first bepurified since all water sources should be considered as being contaminated. Which of the followingis not an acceptable method for water purification?a. Adding 2 drops of iodine or bleach toa quart of waterb. Use a commercially produced charcoalfilterc. Boiling the water for 2 minutesd. Filtering the water through a tight-mesh cloth

Use a commercially produced charcoalfilter

Explanation:

Water found in streams, depressions and ground water must be contaminated with pathogenic microorganisms. The methods of disinfection using iodine or bleach or boiling the water for about two minutes and then filtering it with a clean cloth will effectively remove the microorganisms.

However, charcoal filters do not eliminate microorganisms from water hence this method is not acceptable in this case.

colorless gas, exhibiting a blue glow when placed in an electric field

b) solid

its a type of rock