What is the coordination entity formed w...

What is the coordination entity formed when excess of aqueous KCN is added to an aqueous solution of copper sulphate?

A

`CuCN`

B

`K_3[Cu(CN)_6]`

C

`K[Cu(CN)_4]`

D

`K_3[Cu(CN)_4]`

Text Solution

Verified by Experts

The correct Answer is:

D

When excess of KCN(aq) is mixed with `CuSO_4(aq)`, a complex named potassium tetracyanocuprate (II) is formed. Since , `CN^(-)` ions are strong ligands, the complex is quite stable.
`2Cu^(2+) + 2CN^(-) to 2Cu^(+) + C_2N_2 , 2Cu^(+) + 2CN^(-) to 2CuCN`
`CuCN + 3CN^(-) to [Cu(CN)_4]^(3-)`

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Knowledge Check

Which compound is formed when excess of KCN is added to an aqueous solution of copper sulphate?

A

`CuCN_(3)`

B

`CuCn`

C

`K_(2)[CuCN_(4)]`

D

`K_(3)[CuCN_(4)]`

The aqueous solution of borax is

A

Acidic

B

Alkaline

C

Neutral

D

Amphoteric

aqueous solution of ammonium acetate is

A

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B

faintly alkaline

C

fairly neutral

D

fairly acidic

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