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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)`

Text Solution

Verified by Experts

The correct Answer is:
5
Five , i.e., `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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How many of the following compounds will decolourize the colour of acidified KMnO_(4) ? {:(H_(2)S,FeSO_(4),NaNO_(2)),(Na_(2)SO_(3),PbS,Na_(2)S),(NaNO_(3),Na_(2)SO_(4),CO_(2)),(SO_(3),P_(2)O_(5),):}