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Ionic Bond

H2S gas when ...

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H2S gas when passed through a solution of cations containing HCl precipitates the cations of second groupof qualitative analysis but not those belonging to the fourth group. It is because (1) Presence of HCl decreases the sulphide ion concentration (2) Presence of HCl increases the sulphide ion concentration (3) Solubility product of group II sulphides is more than that of group IV sulphides (4) Sulphides of group IV cations are unstable in HCl

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H_{2} S

gas when passed through a solution of cations containing

H C l

precipitates the cations of the second group of qualitative analysis but not those belonging to the fourth group. It is because:

H_{2} S

gas when passed through a solution of cations containing

H C l

precipitaes the cations of second group of qualitative analysis but not those belonging to the fourth group. It is because

H_{2} S

is passed through the solution in an acidic medium to precipitate the sulphides of group II cations but in an alkaline medium to precipitate the sulphides of group IV cations because:

Q. Assertion :The test of the second group with the sulfide ion must be conducted in the presence of dilute

H C l

H C l

gives the proper buffer solution that controls the concentration of sulphide so that precipitation of further group cation can be ceased.

Q. In presence of

H C l (a q .); H_{2} S

gas results the precipitation of group-2 cations but not of group-4 cations during qualitative analysis. It is due to:

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