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Zinc pieces are added to the acidified solution of SO₃^-2. AGs liberated can :
Option: 1
turn lead acetate paper black

Option: 2
turns lime water milky

Option: 3
gives both of the above tests

Option: 4
gives none of the above tests

Answers (1)

best_answer

Test of Sulfite -

1) Add $BaCl_2$ solution which gives white precipitate

$Ba^{2+} +SO^{2-}_3 \rightarrow BaSO_3 \: White$

2) Add an $H_2O_2$ solution warm and then add a $BaCl_2$ solution

$SO^{2-}_3 +H_2O_{2} \rightarrow SO^{2-}_4 +H_2O$

$Ba^{2+}+ SO^{2-}_4 \rightarrow BaSO_4 (white)$

$BaSO_4$ is insoluble in HCl & $HNO_3$

- wherein

White ppt of $BaSO_4 \: and \: BaSO_4$ confirm the presence of $SO^{2-}_3$

Test of Sulfide ion -

Add a Sodium nitroprusside solution in an alkaline midium

$Na_2S + Na_2(Fe(CN)_5NO) \overset{NaOH}{\rightarrow} Na_4(Fe(CN)_6 NOS) \: Purple$

- wherein

Purple color confirm the presence of $S^{2-}$

SO3²⁺ + Zn + 8H⁺ → H₂S + 3Zn²⁺ + 3H₂O

Pb²⁺ + S^2- $\rightarrow$ PbS (black)

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