gas when passed through a solution of cations containing HCl precipitates the cations of second group of qualitative analysis but not those belonging to the fourth group. It is because
Text Solution
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The cation of group II are precipitated as their sulphides.
Solubility product of sulphide of group II radicals are very low. Therefore, even with low conc. of 
ions, the ionic product exceeds the value of their solubility product and the radical of group II gets precipitated. The low conc. of 
ions is obtained by passing 
gas through the solution of the salt in the presence of 
. HCl which suppresses degree of ionisation of 
by common ion 
ect.
common ion
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