What will be the colour of the solution when \( \mathrm{Mn}(\mathrm{OH})_{2} \) is treated with ...

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What will be the colour of the solution when \( \mathrm{Mn}(\mathrm{OH})_{2} \) is treated with concentrated \( \mathrm{HNO}_{3} \) and sodium bismuthate (or red lead or lead dioxide)?
(a) Yellow
(b) Purple
(c) Green
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