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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&nbsp

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+ + S2-\rightarrow PbS  (black)

Posted by

Pankaj

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