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State one observation for the following:...

State one observation for the following: Lead nitrate is heated strongly in a test tube.

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Lead nitrate is heated strongly in a test tube to give a cracking sound and a reddish brown gas `(NO_(2))`.
`2Pb(NO_(3))_(2)(s) overset("Heat")to 2PbO+4NO_(2)uarr+O_(2)(g)`
Reddish brown gas
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