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  4. The addition of NaOH to Cr3 + solution produces the precipitate of

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Q. The addition of NaOH to $Cr^{3 +}$ solution produces the precipitate of

NTA AbhyasNTA Abhyas 2020The d-and f-Block Elements

Solution:

$Cr ( OH )_{3}$ is not precipitated, but the hydrated oxide, $Cr _{2} O _{3}\left( H _{2} O \right)_{ n }$ is precipitated

$Cr ^{3+}+3 OH ^{-} \rightarrow Cr ( OH )_{3} \rightarrow Cr _{2} O _{3}\left( H _{2} O \right)_{ n }$