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Assertion (A) Calgon is used for removing `CA^(2+) and Mg^(2+)` ions from hard water.
Reason (R ) Calgon forms precipitates with `Ca^(2+) and Mg^(2+)`
A. Both A and R are true and R is the correct explanation of A
B. Both A and R are true but R is not a correct explanation of A
C. A is true but R is fales
D. Both A and R are fales.

1 Answer

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Correct Answer - D
Both assertion (A) and reason ( R) are not true.
Correct Assertion : Calgon mask the properties of `Ca^(2+)` and `Mg^(2+)` ions present in water without removing them as ppt.
Correct Reason. Calgon forms soluble complexes with `Ca^(2+)` and `Mg^(2+)` in which properties of these ions are masked.

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