Question

When crystals of lead nitrate are heated strongly in a dry test tube do the crystals immediately melt

Answer 1

When lead nitrate is heated strongly it breaks down to form simpler substances like lead monoxide,nitrogen dioxide and oxygen.In this decomposition reaction the colourless compound lead nitrate forms a yellow compound lead monoxide and brown fumes of nitrogen dioxide gas are evolved.

Answer 2

$\huge \tt yes \: \: ,\: they \: \: \: melt$