Question

16. The colour of the gas evolved on heating solid lead nitrate is:
(a) yellow
(b) brown
(c) greenish-yellow
(d) green​

Answer 1

Answer:

brown colour gas envoled on heating solid lead nitrate

Answer 2

The colour of the gas evolved on heating solid lead nitrate is brown.

• When solid lead nitrate is heated, it decomposes to form a lead oxide, nitrogen dioxide and oxygen.

• Thus, on decomposition lead nitrate gives lead oxide, nitrogen dioxide and oxygen.

• Lead nitrate when heated strongly, produces Lead oxide (PbO), Nitrogen dioxide( NO2) and oxygen(O2).

• The lead nitrate turns yellow due to the resultant product- lead oxide (PbO) and a reddish-brown gas which is nitrogen dioxide is evolved.

Reaction:

• When lead nitrate is heated, it breaks down or decomposes into yellow color lead oxide, colorless gas of oxygen and brown color nitrogen dioxide.

The chemical equation for the reaction is:

                                 2Pb(NO₃)₂ → 2PbO + 4NO₂ + O₂

Hence, option (b) is the correct answer.

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