Question

Which is the brown coloured gas evolved when lead nitrate Crystals are heated in a dry test tube.

Answer 1

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Answer 2

The gas evolved when Lead Nitrate Crystals are heated in dry test tube is Nitrogen dioxide.

Explanation:

• Lead Nitrate crystals when heated in a dry test tube it gets decomposed and forms Lead Oxide as product and Nitrogen dioxide and Oxygen gases as by-products.

• This Nitrogen dioxide $NO_2$  is a brown coloured gas will be evolved from the reaction after it gets processed.

• The composition of the Lead Nitrate is $Pb(NO_3)_2$.

• The reaction is:

       $2Pb(NO_3)_2 \rightarrow 2PbO + 4NO_2 + O_2$ (in presence of heat).

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