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Presence of which of the following compo...

Presence of which of the following compounds makes water hard ?
`Na_(2)SO_(4),Ca(HCO_(3))_(2),MgCl_(2),Na_(2)CO_(3),CaSO_(4),KCl,NaHCO_(3),MgSO_(4),CaCl_(2)`

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The correct Answer is:
5
Five, `Ca(HCO_(3))_(2), MgCl_(2), CaSO_(4), MgSO_(4), CaCl_(2)`
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Presence of which of the forcoming compounds makes water hard ? Na_(2)SO_(4),Ca(HCO_(3))_(2),MgCl_(2),Na_(2)CO_(3),CaSO_(4),KCl,NaHCO_(3),MgSO_(4),CaCl_(2)

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