क्लोरीन के निम्नलिखित रूपों में से किसमें कोई कीटाणुनाशक गुण नहीं होता है?

Turbidity in water is measured on which standard scale?

Mudball formation in rapid sand filters is the result of:

In a water sample, if 2 mg of platinum cobalt salt is dissolved in 1 litre of distilled water, then the colour produced is equal to: