Black coloured solid $(A) K N O_{3} + K O H - ------- \to Δ g r e e n c o l o u r e d ↓ s o l u t i o n (B) C O_{2} (C) p i n k + (A)$
(C) is decolorised by $F e^{2 +}$ .

If the Black colourd solid (A) is $M n O_{2}$ enter 1 else enter 0.

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Solution

Black colored solid (A) is $M n O_{2}$
$M n O_{2} (A) + K O H + O_{2} (K N O_{3}) Δ \to g r e e n - ---- \to K_{2} M n O_{4} (B)$
$C O_{2} + H_{2} O ⇌ H_{2} C O_{3} ⇌ H^{+} + H C O_{3}^{-}$
$3 M n O_{4}^{2 -} + 4 H^{+} \to M n O_{2} + 2 M n O_{4}^{-} + 2 H_{2} O$

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M n^{2 +}

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