A metal nitrate 'A' on heating gives yellowish brown colored metal oxide along with brown gas 'B' and a colorless gas 'C'. Aqueous solution of 'A' on reaction with potassium iodine forms a yellow precipitate of compound 'D'. Identify A,B,C,D. Identify the types of both reaction. Metal present in A is used in making paints.



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A - Lead Nitrate (PbNO3)
B - Nitrogen dioxide (NO2)
C - Oxygen (O2)
D - Lead Iodide (PbI2)
1 5 1
Identify the types of both reaction??
1st rxn is a thermal decomposition rxn. 2nd rxn is a double decomposition (or precipitation) rxn