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Assertion (A): Hardness of water is dete...

Assertion `(A)`: Hardness of water is determined by titrating it with disodium salt of `EDTA`.
Reason `(R)` :The indicator used in the titration is Eriochrome Black`-T` at `pH=10`.

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The correct Answer is:
A
Both (A) and (R) are correct and (R) is the correct explantion of (A).
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