Question

When let nitrate is heated in a hardglass test tube it decompose with the cracking sound a redism brown gas is relased and a solid residue is also left out in the test tube?

Answer 1

Lead nitrate is the white crystalline salt. When it is heated it makes a crackling noise and produce 2 gases NO2NO3.The color of NO2gas is reddish brown. And the precipitate is lead oxide which is yellow in color.

Pb(NO3)2→PbO+NO2+NO3