Analytical ChemistryHard
Question
Which of the following sulphides do not dissolve in 50% HNO3 but dissolve in aquaregia ?
Options
A.CoS
B.NiS
C.CuS
D.HgS
Solution
CuS dissolves in 50% HNO3 ; 3CuS + 8HNO3 → 3Cu2+ + 6NO3- + 3S↓ + 2NO↑ + 4H2O
But NiS, CoS and HgS do not dissolve in 50% HNO3 and dissolve in aquaregia forming their chlorides.
But NiS, CoS and HgS do not dissolve in 50% HNO3 and dissolve in aquaregia forming their chlorides.
Create a free account to view solution
View Solution FreeMore Analytical Chemistry Questions
Ferric alum gives deep red colour with NH4SCN due to the formation of :...In which of the following pairs the precipitates are red and black coloured respectively and both precipitates are solub...Identify the compound which turns black with ammonia solution....The Lassaigne′s extract is boiled with dil. HNO3 before testing for halogens because...The compound insoluble in acetic acid is :...