Residual chlorine in water is determined by
A. Starch iodide method
B. Orthotolidine method
C. Both (A) and (B)
D. None of the above
Answer: Option C
Solution(By Examveda Team)
Residual chlorine
in water can be determined using both the Starch iodide method
and the Orthotolidine method
.The
Starch iodide method
involves adding a solution of starch and potassium iodide to the water sample containing residual chlorine. The residual chlorine oxidizes iodide ions to iodine, which then reacts with starch to form a blue complex, indicating the presence of residual chlorine.The
Orthotolidine method
is another commonly used method for determining residual chlorine in water. In this method, orthotolidine (OT) reacts with residual chlorine to form a yellowish-brown color, which is then quantified spectrophotometrically.Therefore, Option C: Both (A) and (B) is the correct choice, as both the Starch iodide method and the Orthotolidine method can be used to determine residual chlorine in water.
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