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Whivh of the following is not a hard water ?

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Whivh of the following is not a hard water ?
A. Water containing `CaCl_(2)`
B. Water containing dil. `HCl`
C. Water containing `MgSO_(4)`
D. None of these
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Correct Answer - d
Water containing `Ca^(+2),Mg^(+2)` and `H^(+)(gt10^(-7)m)` is a hard water .
`H^(+)(aq)+CH_(3)COONa(aq)=CH_(3)COOH(s)+Na^(+)(aq)`
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