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  • On heating lead (II) nitrate gives a brown gas “A”. The gas “A” on cooling changes to colourless solid “B”. Solid “B” on heating with NO changes to a blue solid C. Identify A, B and C and also write reactions involved and draw the structures of B and C.

On heating lead (II) nitrate gives a brown gas “A”. The gas “A” on cooling changes to colourless solid “B”. Solid “B” on heating with NO changes to a blue solid C. Identify A, B, and C and also write the reactions involved and draw the structures of B and C.

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The gas A is NO_{2} . The reactions are given as under:

2Pb\left ( NO_{3} \right )_{2}\overset{Heat}{\rightarrow}2PbO+4NO_{2}+O_{2}

2NO_{2}\overset{Cooling}{\rightarrow}N_{2}O_{4}

2NO+N_{2}O_{4}\overset{Heat}{\rightarrow}2N_{2}O_{3}

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