Question

Megha takes a sample of white lead nitrate [\text{Pb}(\text{NO}_3)_2Pb(NO
3
​
)
2
​
start text, P, b, end text, left parenthesis, start text, N, O, end text, start subscript, 3, end subscript, right parenthesis, start subscript, 2, end subscript] powder in a test tube and heats it over a flame. Brown fumes are released and the colour of the powder changes to yellow.
What is the product obtained during this thermal decomposition reaction?
Choose 1 answer:

Answer 1

Product obtained will be -

Lead oxide, nitrogen dioxide and oxygen.

(Product can be named without options)

When the compound lead nitrate is heated, it undergoes decomposition reaction. The brown flames obtained indicate nitrogen dioxide has been evolved.

Lead nitrate is white in colour which after reaction converts to yellow. The color indicates formation of lead oxide which is yellow in colour.

The complete reaction is :

2Pb(NO3)2 --heat--> 2PbO + 4NO2 + O2

In the reaction, Pb(NO3)2 is lead nitrate, PbO is lead oxide, NO2 is nitrogen dioxide and O2 is oxygen.