Question

State one observation:

Lead nitrate is heated strongly in a test tube.

Answer 1

A yellow solid of lead oxide \[\ce{(PbO)}\] is fused with glass, and a reddish-brown nitrogen dioxide gas is evolved along with \[\ce{O2}\].

\[\ce{2Pb(NO3)2 ->[\Delta] 2PbO + 4NO2 + O2}\]