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Question

A student took some lead nitrate compound in a boiling tube and heated it strongly. The gas/gases evolved on heating this compound is/are :
(1) NO2
(2) NO2 + CO2
(3) NO2 + O2
(4) N2 + O2

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Solution

When lead nitrate is heated it splits into simpler substances,
2Pb(NO3)2Colourless2PbOYellow ppt+4NO2Brown fumes+O2
So, NO2 and O2 are liberated from the reaction.

Hence, the correct answer is option 3.

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