The addition of dilute \( \mathrm{NaOH} \) to \( \mathrm{Cr}^{3+} \) salt solution will give (a)...

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The addition of dilute \( \mathrm{NaOH} \) to \( \mathrm{Cr}^{3+} \) salt solution will give
(a) A solution of \( \left[\mathrm{Cr}(\mathrm{OH})_{4}\right]^{-} \)
(b) Precipitate of \( \mathrm{Cr}_{2} \mathrm{O}_{3}\left(\mathrm{H}_{2} \mathrm{O}\right)_{\mathrm{n}} \)
(c) Precipitate of \( \left[\mathrm{Cr}(\mathrm{OH})_{6}\right]^{3-} \)
(d) Precipitate of \( \mathrm{Cr}(\mathrm{OH})_{3} \)
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