1.

Which of the following pairs of ions when mixed in dilute solutions may give precipitate [CPMT 1976; NCERT 1987; Kurukshetra CEE 1998]

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


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