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

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Strategy:
 Trace the qualitative analysis pathway for  ions reacting with bases. Identify what happens uniquely with dilute quantities rather than excess.

Step 1: Reaction with dilute base
When dilute  (a source of ) is added to a solution containing  ions, a gelatinous precipitate of Chromium(III) hydroxide forms.
  (Grey-green precipitate).
(Note: Sometimes formulated dynamically as hydrated metal oxides ).

Step 2: Contrast with excess base
If excess  were added, the amphoteric  would dissol

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