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Q.

The correct statement (s) among the following is/are 

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a

When aqueous KCN is added in excess to a blue solution of  CuSO4  it becomes colourless

b

If aqueous KCl is added to blue    CuSO4  solution a green [CuCl4]2  complex is formed  

c

If aqueous KI is added to blue   CuSO4solution a brown solution and a white precipitate are  Formed

d

When aqueous KF is added to blue  CuSO4 solution a green CuF2  is precipitated

answer is A, B, C, D.

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Detailed Solution

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CuF2  (Green colour), [CuCl4]2  (Green colour), Cu2I2(colourless) , K3[Cu(CN)4](colourless)

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