When Lead nitrate is heated it decomposes with a cracking sound, a reddish brown gas is liberated and a solid residue is left in the test tube. Write the name and formula of the gas.

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Solution

1. Decomposition reaction
A decomposition reaction is a type of reaction in which the reactant compound is broken down into more than one smaller compound when exposed to certain conditions.
2. Heating of Lead nitrate
Lead nitrate undergoes a decomposition reaction to give a solid residue named Lead oxide and a reddish-brown gas named Nitrogen dioxide.
The reaction for the decomposition of Lead nitrate $[Pb {({NO}_{3})}_{2}]$ is given below.
$2 Pb {({NO}_{3})}_{2} (aq) \to 2 PbO (s) + 4 {NO}_{2} (g) + O_{2} (Lead nitrate) (Lead oxide) (Nitrogen (Oxygen) dioxide)$
Hence, the reddish-brown gas liberated is Nitrogen dioxide and its formula is ${NO}_{2}$ . The solid residue is Lead oxide $(PbO)$ .

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