One tablet of chlorine is effective to disinfect how much quantity of water
**Core Concept**
Chlorine is a disinfectant commonly used to treat drinking water due to its ability to inactivate bacteria, viruses, and other pathogens. The effectiveness of chlorine as a disinfectant depends on its concentration and contact time with the water.
**Why the Correct Answer is Right**
The correct answer is based on the concept of the "chlorine demand" of water, which refers to the amount of chlorine required to completely inactivate the pathogens present in the water. According to the World Health Organization (WHO), one tablet of chlorine (containing 5 grams of calcium hypochlorite) is effective in disinfecting 10 liters of water. This is because the chlorine in the tablet reacts with the organic matter and other contaminants in the water, consuming the chlorine and reducing its available free chlorine level.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not take into account the chlorine demand of the water, which can vary depending on the level of contamination.
**Option B:** This option is incorrect because it is too low, and a single tablet of chlorine would not be sufficient to disinfect such a large volume of water.
**Option C:** This option is incorrect because it is too high, and a single tablet of chlorine would be excessive for such a small volume of water.
**Clinical Pearl / High-Yield Fact**
The correct dosage of chlorine for disinfecting water is critical to ensure its safety for consumption. It is essential to use the correct amount of chlorine to avoid over-chlorination, which can lead to the formation of harmful byproducts.
**Correct Answer:** D.