A metal nitrate $A$ on heating gives yellowish brown coloured metal oxide along with brown gas $B$ and a colourless gas $C$ . An aqueous solution of $A$ on reaction with potassium iodide forms a yellow precipitate of compound $D$ . Identify $A, B, C$ and $D$ . Also, identify the types of reactions taking place. Metal present in $A$ is used in an alloy which is used for soldering purposes.

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Solution

The metal nitrate $(A)$ is lead nitrate $(P b (N O_{3})_{2})$ on heating it produces lead oxide, Nitrogen dioxide $(B)$ and oxygen gas $(C)$
(1) $2 P b (N O_{3})_{2} \to 2 P b O + 4 N O_{2} + O_{2}$
on reaction with potassium iodide mixture of lead iodide and potassium nitrate forms
(2) $P b (N O_{3})_{2} + 2 K I \to P b O_{2} + 2 k N O_{3}$
Alloy made of using lead is used in Soldering purpose.
Therefore $A = [P b (N O_{3})_{2}), B = N O_{2}$
$C = O_{2} D = P b I + K N O_{3}$
(2) Decompostion type Reaction
(2) Double displacement type Reaction.

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