A salt on treatment with dil. HCl gives a pungent smelling gas and a yellow precipitate. The salt gives green flame test and a yellow precipitate with potassium chromate the salt is

Question

A salt on treatment with dil. HCl gives a pungent smelling gas and a yellow precipitate. The salt gives green flame test and a yellow precipitate with potassium chromate the salt is (A)  NiSO4  (B)  BaS2O3  (C)  PbS2O3  (D)  CuSO4

Tardigrade Admin · Accepted Answer

Since, the salt on treatment with dil. HCl gives a pungent smelling gas (SO2) and a yellow ppt., it must contain S2O32- (thiosulphate ion) and further since it gives green flame test, it must contain Ba2+ ion. Therefore, salt is BaS2O3 .

Q. A salt on treatment with dil. $H Cl$ gives a pungent smelling gas and a yellow precipitate. The salt gives green flame test and a yellow precipitate with potassium chromate the salt is

$N i S O_{4}$

$B a S_{2} O_{3}$

$P b S_{2} O_{3}$

$C u S O_{4}$

Since, the salt on treatment with dil. $H Cl$ gives a pungent smelling gas $(S O_{2})$ and a yellow ppt., it must contain $S_{2} O_{3}^{2 -}$ (thiosulphate ion) and further since it gives green flame test, it must contain $B a^{2 +}$ ion. Therefore, salt is $B a S_{2} O_{3}$ .

Q. A salt on treatment with dil. HCl gives a pungent smelling gas and a yellow precipitate. The salt gives green flame test and a yellow precipitate with potassium chromate the salt is

NiSO4​

BaS2​O3​

PbS2​O3​

CuSO4​