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The colour of $\mathrm{Mg}(\mathrm{OH})_2$ precipitate formed when it is precipitated in the presence of magneson reagent is
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Blue
It is a violet dye and experimentally as a $\mathrm{pH}$ indicator, appearing yellow below $\mathrm{pH11}$ and violet above $\mathrm{pH} 13$.
In alkaline medium, it forms a complex with $\mathrm{Mg}^{2+}$, which is deep blue in colour.
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