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Redox Reactions

When colourle...

Question

When colourless solution (C) reacts with $P b_{3} O_{4} / H^{+}$ , it acquires a violet red colour due to formation of__________.

M n O_{4}^{-}

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P b O_{2}

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I_{3}^{-}

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[N i (e n)_{3}] S_{2} O_{3}

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Solution

The correct option is A $M n O_{4}^{-}$
Reaction is:
$4 H_{2} S O_{4} + M n S \to M n S O_{4} + 4 S O_{2} + 4 H_{2} O$
$80 H N O_{3} + 20 M n S O_{4} + 20 P b_{3} O_{4} \to 20 H M n O_{4} + 20 P b S O_{4} + 40 P b (N O_{3})_{2} + 3 H_{2} O$

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