The correct answer is Option (3) → EDTA
The correct answer is: EDTA (Ethylenediaminetetraacetic acid)
Explanation:
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EDTA is a chelating ligand that forms stable complexes with metal ions like Ca²⁺ and Mg²⁺, which are responsible for the hardness of water.
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In water hardness estimation (typically through titration), EDTA binds to these metal ions, allowing precise measurement.
Incorrect options:
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DMG (Dimethylglyoxime): Used for detection of nickel ions.
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DMSO (Dimethyl sulfoxide): A solvent, not a chelating agent.
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Ethylenediamine: A bidentate ligand, but not typically used alone for hardness estimation.
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