1.

Which of the following pairs of ions would be expected to form precipitate when their dilute solution are mixed [CPMT 1976]

A.   \[N{{a}^{+}},\,SO_{3}^{2-}\]       
B.          \[NH_{4}^{+},\,CO_{3}^{2-}\]  
C.     \[N{{a}^{+}},\,{{S}^{-2}}\]       
D.    \[F{{e}^{+3}},\,PO_{4}^{-3}\]
Answer» E.


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