First slide

Hardness of water

Question

Which of the following compounds is used for water softening?

Moderate

A

Ca₃(PO₄)₂
B

Na₃PO₄
C

Na₆P₆O₁₈
D

Na₂HPO₄

Solution

Na₆P₆O₁₈ acts as Na₂[Na₄(PO₃)₆] is also known as Calgon which can be used for removal of permanent hardness of water

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