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Choose the correct tests with respective observations. (A) ( CuSO ₄ ) (acidified with acetic acid) (+ K ₄ [ Fe ( CN )₆ ] ) Chocolate brown precipitate. (B) ( FeCl ₃+ K ₄ [ Fe ( CN )₆ ] ) Prussian blue precipitate. (C) ( ZnCl ₂+ K ₄ [ Fe ( CN )₆ ] ), neutralised with ( NH ₄ OH ) ( ) White or bluish white precipitate. (D) ( MgCl ₂+ K ₄ [ Fe ( CN )₆ ] ) Blue precipitate. (E) ( BaCl ₂+ K ₄ [ Fe ( CN )₆ ] ), neutralised w

Options

  1. AA, D and E only
  2. BB, D and E only
  3. CA, B and C only
  4. DC, D and E only

Correct answer

C. A, B and C only

Step-by-step solution

(2 CuSO ₄+ K ₄ [ Fe ( CN )₆ ] CH ₃ COOH (Chocolate brown ppt.) Cu ₂ [ Fe ( CN )₆ ]+2 ~K ₂ SO ₄ ) (4 FeCl ₃+3 ~K ₄ [ Fe ( CN )₆ ] (Prussian Blue ppt.) Fe ₄ [ Fe ( CN )₆ ]₃ +12 KCl ) (3 ZnCl ₄+2 ~K ₄ [ Fe ( CN )₆ ] NH ₄ OH (White or bluish white ppt.) K ₂ Zn ₃ [ Fe ( CN )₆ ]₂ +6 KCl )

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