Question

H2s gas is passed in presence of nh4oh in group 4 why

Answer 1

Solubility product of sulphides of II group radicals are less than solubility product of sulphides of IV group. So to pricipitate II group radicals as sulphides little S2-are sufficient. In presence of Dil HCl little S2- are released due to the common ion effects. In IV group the ionisation of H2S is favoured by the use of NH4OH