The addition of dilute NaOH to Cr3+ salt solution will give :

Question:

The addition of dilute NaOH to Cr3+ salt solution will give :

  1. a solution of $\left[\mathrm{Cr}(\mathrm{OH})_{4}\right]^{-}$

  2. precipitate of $\mathrm{Cr}_{2} \mathrm{O}_{3}\left(\mathrm{H}_{2} \mathrm{O}\right)$

  3. precipitate of $\left[\mathrm{Cr}(\mathrm{OH})_{6}\right]^{3-}$

  4. precipitate of $\mathrm{Cr}(\mathrm{OH})_{3}$

Correct Option: , 2

Solution:

$\mathrm{Cr}^{3+}+\underset{\text { dil. }}{\mathrm{NaOH}} \longrightarrow \underset{\text { precipitate }}{\mathrm{Cr}_{2} \mathrm{O}_{3} \cdot\left(\mathrm{H}_{2} \mathrm{O}\right)_{\mathrm{n}}}$

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