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p- Block Elements — Chemistry STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceChemistryp- Block Elements1 Mark
Question
On heating $Pb \left( NO _3\right)_2$ a brown gas is evolved which undergoes dimerization on cooling. Identify the gas.
✓

Answer

Nitrogen dioxide gas ( $NO _2$ )
$2 Pb\left( NO _3\right)_2 \xrightarrow{\Delta} 2 PbO +4 NO _2+ O _2$
$2 NO _2 \longrightarrow N_2 O _4$

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