Which of the following pairs of ions,when the | vedclass

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(D) Precipitation occurs when the combination of ions forms an insoluble salt. $1$. $K^{+}$ and $SO_4^{2-}$ form $K_2SO_4$,which is soluble in water.

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$Al^{3+}, OH^{-}$

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(D) Precipitation occurs when the combination of ions forms an insoluble salt. $1$. $K^{+}$ and $SO_4^{2-}$ form $K_2SO_4$,which is soluble in water. $2$. $Na^{+}$ and $S^{2-}$ form $Na_2S$,which is soluble in water. $3$. $Ag^{+}$ and $NO_3^{-}$ form $AgNO_3$,which is soluble in water. $4$. $Al^{3+}$ and $OH^{-}$ react to form $Al(OH)_3$,which is an insoluble white precipitate. Therefore,the correct pair is $Al^{3+}$ and $OH^{-}$.

Which of the following pairs of ions,when their solutions are mixed,will result in precipitation?

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