A) \[NiS{{O}_{4}}\text{ }\]
B) \[Ba{{S}_{2}}{{O}_{3}}\]
C) \[Pb{{S}_{2}}{{O}_{3}}\]
D) \[CuS{{O}_{4}}\]
Correct Answer: B
Solution :
Since, the salt on treatment with dil. \[\text{HCl}\] gives a pungent smelling gas \[(S{{O}_{2}})\] and a yellow ppt., it must contain \[{{\text{S}}_{\text{2}}}\text{O}_{3}^{2-}\] (thiosulphate ion) and further since it gives green flame test, it must contain \[\text{B}{{\text{a}}^{\text{2+}}}\]ion. Therefore, salt is \[\text{Ba}{{\text{S}}_{\text{2}}}{{\text{O}}_{\text{3}}}\text{.}\]
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