Which pair would not be expected to form precipitate when solutions are mixed?

K^{+}

S O_{4}^{2 -}

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N a^{+}

S^{2 -}

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A g^{+}

N O_{3}^{-}

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A l^{3 +}

O H^{-}

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Solution

The correct options are
A $N a^{+}$ , $S^{2 -}$
B $A g^{+}$ , $N O_{3}^{-}$
C $K^{+}$ , $S O_{4}^{2 -}$
Option (A),(B),(C) are correct.
$A l {(O H)}_{3}$ is insoluble in water.

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