A) \[N{{a}_{2}}[N{{a}_{4}}{{(P{{O}_{3}})}_{6}}]\]
B) \[N{{a}_{4}}[N{{a}_{2}}{{(P{{O}_{3}})}_{6}}]\]
C) \[N{{a}_{2}}[N{{a}_{4}}{{(P{{O}_{4}})}_{5}}]\]
D) \[N{{a}_{4}}[N{{a}_{4}}{{(P{{O}_{4}})}_{6}}]\]
Correct Answer: A
Solution :
Calgon is used for water softening. Its formula is \[\text{N}{{\text{a}}_{2}}[(N{{a}_{4}}{{(P{{O}_{3}})}_{6}}].\]
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