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     EduGorilla 
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    Which of the following methods are employed for determination of free and combined chlorine residuals in water?
    1. Starch-iodide method
    2. Orthotolidine method
    3. Amperometric titration method
    4. SNORT method
    5. DPD method

    Options :-

    1. 1, 2, 4 and 5
    2. 1, 2 and 3 only
    3. 3, 4 and 5 only
    4. 2, 3, and 4 only.
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