Question
A compound on heating gives a crackling sound, a reddish fume, and a gas which relights a glowing splint. the residue is reddish brown when hot and yellow when cold. What are- 1. the compound? 2. the fume 3. the gas
4. the residue?
4. the residue?
Answers
DrBob222
Not much to go on here.
My best guess is
compound is Hg(NO3)2
fume is NO2
gas is NO2 AND O2
residue is HgO/Hg(NO3)2/Hg mixture although the Hg may be driven off at an elevated temperature.
HgO is the right color at the two temperatures (hot and cold), NO2 is reddish-brown fume, O2 will relight an extinguished glowing splint.
Hg(NO3)2 --> HgO + NO2 step 1
2HgO ==> 2Hg + O2 step 2
My best guess is
compound is Hg(NO3)2
fume is NO2
gas is NO2 AND O2
residue is HgO/Hg(NO3)2/Hg mixture although the Hg may be driven off at an elevated temperature.
HgO is the right color at the two temperatures (hot and cold), NO2 is reddish-brown fume, O2 will relight an extinguished glowing splint.
Hg(NO3)2 --> HgO + NO2 step 1
2HgO ==> 2Hg + O2 step 2
Eze Nnaemeka
Equetion for reaction Pb(NO3)2----> PbO + O2 + NO2 (1) Pb(NO3)2 (2) NO2 (3) O2 (4) PbO