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Standard XII

Chemistry

Chlorides of Phosphorus

If the below ...

Question

If the below given statements are true, write 1, else 0.
Colourless salt (A) + conc. $H_{2} {S O}_{4} ⟶$ brown fumes which intensify on adding Cu turnings.
Aqueous solution (A) + $C u ⟶$ blue coloured solution (B) and metal (C).
Aqueous solution (A) + $H C l ⟶$ white ppt. soluble in aqueous ${N H}_{3}$ (D).
Here, (A) is ${A g N O}_{3}$ , (B) is ${C u ({N O}_{3})}_{2}$ , (C) is $A g$ and (D) is $[{A g ({N H}_{3})}_{2}] C l$ .

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Solution

The colourless salt (A) is ${A g N O}_{3}$ . The brown fumes are due to the evolution of nitrogen dioxide $(N O_{2})$ .
$A g N O_{3} + H_{2} S O_{4} \to A g H S O_{4} + H N O_{3}$
$4 H N O_{3} \to 4 N O_{2} ↑ + O_{2} + 2 H_{2} O$
These brown fumes intensify on addition of copper turnings.
$3 C u + 8 H N O_{3} \to 3 C u (N O_{3})_{2} + 2 N O ↑ + 4 H_{2} O$
$2 N O + O_{2} \to 2 N O_{2} b r o w n f u m e s ↑$
The blue coloured solution (B) is ${C u ({N O}_{3})}_{2}$ .
The metal (C) is $A g$ .
$C u + 2 A g N O_{3} \to 2 A g ↓ + C u (N O_{3})_{2}$
Silver nitrate reacts with HCl to form white precipitate of AgCl, which dissolves in ammonia to form (D) $[{A g ({N H}_{3})}_{2}] C l$ .
$A g N O_{3} + H C l \to A g C l w h i t e p r e c i p i t a t e + H N O_{3}$
$A g C l + 2 N H_{3} \to [{A g ({N H}_{3})}_{2}] C l$

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