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Q.

Calgon is used to remove permanent hardness of water. It is a salt of

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a

Ortho phosphoric acid

b

Pyro phosphoric acid

c

Ortho silicic acid

d

Meta phosphoric acid

answer is D.

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Detailed Solution

Calgon is sodium hexa meta phosphate.

Formula of calgon is ${({NaPO}_{3})}_{6} (or) {Na}_{2} [{Na}_{4} {({PO}_{3})}_{6}]$

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