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
Correct Answer: (3) NO2 + O2
Explanation: On heating lead nitrate, it decomposes into simpler substances, they impart different colour to the solution.
$2Pb(NO_3)_2 → 2PbO + 4NO_2 + O_2$
colourless yellow ppt brown fumes
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