The colour of residue left behind on heating lead nitrate when it is still hot is :
(1) green
(2) yellow
(3) black
(4) reddish-brown

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Solution

When lead nitrate is heated it decomposes into simpler substances, they impart different colour to the solution.
$\underset{colourless}{2 Pb ({NO}_{3})_{2}} \to \underset{yellow ppt}{2 PbO} + \underset{brown fumes}{4 {NO}_{2}} + O_{2}$
Due to the formation of PbO, it shows yellow colour.

Hence, the correct answer is option 2.

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The colour of residue left behind on heating lead nitrate when it is still hot is : (1) green (2) yellow (3) black (4) reddish-brown

When lead nitrate is heated it decomposes into simpler substances, they impart different colour to the solution. 2Pb(NO3)2colourless→2PbOyellow ppt+4NO2brown fumes+O2 Due to the formation of PbO, it shows yellow colour. Hence, the correct answer is option 2.

The colour of residue left behind on heating lead nitrate when it is still hot is :
(1) green
(2) yellow
(3) black
(4) reddish-brown