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Which of the following is(are) correct?
(a) \( \left[\mathrm{Al}(\mathrm{OH})_{4}\right]_{(\mathrm{aq})}^{-}+\mathrm{NH}_{4(\mathrm{aq})}^{+} \stackrel{\text { Slightly heat }}{\longrightarrow} \) White precipitate and liberation of ammonia
(b) \( \mathrm{Pb}^{2+}{ }_{(\mathrm{aq})}+2 \mathrm{Br}^{-}{ }_{(\mathrm{aq})} \longrightarrow \) Red precipitate
(c) \( \mathrm{BiI}_{3} \) (black precipitate) \( +\mathrm{H}_{2} \mathrm{O}(l) \stackrel{\Delta}{\longrightarrow} \) Orange turbidity
(d) \( \mathrm{Fe}^{3+}{ }_{(\mathrm{aq})}+\mathrm{K}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]_{(\mathrm{aq})} \longrightarrow \) Blue precipitate
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