Question

What is observed when lead nitrate is heated in a test tube? Write the equation for the chemical reaction involved and name the type of reaction in this case?

Answer 1

$\bold{NITRATE \: SALTS}$

Nitrate are normal salt of motivation nitric acid formed by replacement in the molecule of acid by a metal ion.

$\bold{LEAD \: NITRATE }$

Lead is transition metal with valency +2.

So, to be stable like nearest noble gas it needs two electrons.

Nitrate is the negative radical with valence -1 .

When lead reacts with nitrate radical it forms lead nitrate. Since, the valency of lead is +2 it will need two nitrate radical.

Lead nitrate is formed by reacting lead with nitric acid, so by displacement reaction it forms, lead nitrate ,water and nitrigon di oxide.

$\bold{Pb + 4HNO_3 \longrightarrow Pb(NO_3)_2 + 2H_2O + 2NO_2}$

$\bold{LEAD \: NITRATE \: IS \: HEATED}$

When lead nitrate is heated, it due to thermal decomposition gives out metal oxide, oxygen and nitrogen dioxide.

Lead gives out a yellow buff coloured residue lead oxide with a reddish brown gas nitrogen dioxide.

$\bold{Pb(NO_3)_2 \longrightarrow 2PbO + 4NO_2 + O_2}$

$\bold{THE \: REACTION \: IS \: THERMAL \: DECOMPOSITION }$

Answer 2

answer:

when lead nitrate is (pb(no3)2 is heated in testtube it will decompose and produce pb, no2 and o2

it is decompostion reaction as well as endothermic reaction

equation

2Pb (NO3)2------> 2PbO+4NO2+O2

hope it will help u