Calgon used for water softening is Na₂ [Na₄ (PO₃)₆] and it is prepared by heating microcosmic salt. The… · ABC26IN0704

Subject: Inorganic Chemistry · Chapter: Main Group Elements · Topic: Main Group Elements – General · Exam: JAM 2005-2022 · Marks: 2 · Difficulty: Medium

Calgon used for water softening is $\mathrm{Na}_{2}\left[\mathrm{Na}_{4}\left(\mathrm{PO}_{3}\right)_{6}\right]$ and it is prepared by heating microcosmic salt. The microcosmic salt is:
(a)$\mathrm{Na}_{2} \mathrm{HPO}_{3}$
(b)$\mathrm{NaH}_{2} \mathrm{PO}_{4}$
(c)$\mathrm{Na}_{2} \mathrm{HPO}_{4}$
(d)$\mathrm{Na}\left(\mathrm{NH}_{4}\right) \mathrm{HPO}_{4}$
Answer
Answer: D ✓ checked by 4AB · confidence high
Explanation
Microcosmic salt is Na(NH₄)HPO₄·4H₂O (d).

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