The p-Block Elements

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Question

Pb(NO₃)₂ on heating gives a brown gas which undergoes dimerization on cooling ? Identify the gas.

Answer

2 Pb left parenthesis NO subscript 3 right parenthesis subscript 2 space left parenthesis straight s right parenthesis space rightwards arrow with increment on top space 2 PbO space left parenthesis straight s right parenthesis space plus 4 NO subscript 2 left parenthesis straight g right parenthesis space

Nitrogen dioxide gas evolved.