The addition of dilute $NaOH$ to $Cr^{3+}$ salt solution will give:
- Aa solution of $[Cr(OH)_{4}]^{-}$
- Bprecipitate of $Cr_{2}O_{3} \cdot nH_{2}O$
- Cprecipitate of $[Cr(OH)_{6}]^{3-}$
- Dprecipitate of $Cr(OH)_{3}$
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