a metal nitateA on heating gives yellowish brown coloured metal oxide along with brown gas B and a colourless gas C. aquepus solution of A on reaction with potassium iodide forms a yellow precipitate of compound D. identify A,B,C,D also identify the type of reactions. metal present in A is used as an alloy which is used for soldering purposes

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Solution

A metal nitrate on heating gives yellowish brown gas, nitrogen oxide (NO₂) . The reaction is :
2Pb (NO₃)₂ $\overset{Heat}{\to}$ 2PbO + 4NO₂ + O₂ (Decomposition reaction )
A = Lead nitrate (Pb (NO₃)₂ )
B = NO₂
C = O₂
Pb (NO₃)₂ + 2KI $\to$ PbI₂ + 2KNO₃ (Double displacement reaction )
D = Yellow precipitate of PbI₂
Lead metal is used as an alloy.

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