Question : The amount of chlorine available in water after disinfection is called as
Option 1: Free chlorine
Option 2: Residual chlorine
Option 3: Free available chlorine
Option 4: Combined available chlorine
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Correct Answer: Residual chlorine
Solution : The correct option is residual chlorine.
The quantity of chlorine that remains in water after disinfection is known as "residual chlorine." The concentration of chlorine (typically in the form of hypochlorous acid and hypochlorite ions) that remains in the water after disinfection is referred to as residual chlorine. Parts per million (ppm) or milligrammes per litre (mg/L) are often used to quantify residual chlorine levels.
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