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The incorrect statement is :

  • Option 1)

    Cu^{2+} salts give red coloured borax bead test in reducing flame.

  • Option 2)

    Cu^{2+}  and Ni^{2+} ions give black precipitate with H2S in presence of HCl solution.

  • Option 3)

    Ferric ion gives blood red colour with potassium thiocyanate.

  • Option 4)

    Cu^{2+} ion gives chocolate coloured precipitate with potassium ferrocyanide solution.

 

Answers (1)

best_answer

As we have learned

Solubility product constant -

e.g.

BaSO_{4}\rightleftharpoons Ba^{2+}(aq)+SO_{4}^{2-}(aq)


K=\frac{[Ba^{2+}]\:[SO_{4}^{2-}]}{[BaSO_{4}]}

- wherein

For a pure solid substance the concentration remain constant

\therefore \:K_{sp}=K[BaSO_{4}]
 

               c
 

    K_{sp}=solubility\:product

 

 

Due to common ion effect , sufficient and concentration not produce and not formed precipitate of NiS

 

 

 

 

 


Option 1)

Cu^{2+} salts give red coloured borax bead test in reducing flame.

This is incorrect

Option 2)

Cu^{2+}  and Ni^{2+} ions give black precipitate with H2S in presence of HCl solution.

This is correct

Option 3)

Ferric ion gives blood red colour with potassium thiocyanate.

This is incorrect

Option 4)

Cu^{2+} ion gives chocolate coloured precipitate with potassium ferrocyanide solution.

This is incorrect

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divya.saini

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