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Phosphorus

A scarlet com...

Question

A scarlet compound (A) is treated with conc. ${H N O}_{3}$ to give a choclate brown precipitate (B). The precipitate is filtered and the filtrate is neutralised with $N a O H$ . Addition to KI to the resulting solution gives a yellow precipitate (C). The precipitate (B) on warming with conc. ${H N O}_{3}$ in the presence of ${M n ({N O}_{3})}_{2}$ produces a pink-coloured solution due to the formation of (D). Compounds (A), (B), (C) and (D) are identified as $P b_{3} O_{4}$ , $P b O_{2}$ , $P B l_{2}$ and $H M n O_{4}$ (pink)

If the given statement is true enter 1 else enter 0.

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Solution

The scarlet compound (A) is $P b_{3} O_{4}$ . It is treated with conc. ${H N O}_{3}$ to give a choclate brown precipitate (B) of $P b O_{2}$ . $P b_{3} O_{4} + 4 H N O_{3} \to 2 P b (N O_{3})_{2} + 2 P b O_{2} + 2 H_{2} O ↓$
The precipitate is filtered and the filtrate is neutralised with $N a O H$ . Addition to KI to the resulting solution gives a yellow precipitate (C). which is $P B l_{4}$ $P b O_{2} + 4 K I \to P B l_{4} + 2 K_{2} O$
The precipitate $P b O_{2}$ on warming with conc. ${H N O}_{3}$ in the presence of ${M n ({N O}_{3})}_{2}$ produces a pink-coloured solution due to the formation of (D) which is $H M n O_{4}$
$5 P b O_{2} + 6 H N O_{3} + {2 M n ({N O}_{3})}_{2} \to H M n O_{4} + 2 H_{2} O + 5 P b (N O_{3})_{2}$

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