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CGP EDU Academic Team
Published on: August 12, 2026
Which of the following is/are correct for potassium ferrocyanide ?
Text Solution
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(a,b,c)
Cu 2+ + [Fe(CN) 6 ] 4– 
Cu 2 [Fe(CN) 6 ] ↓ (brown).
Ca 2+ + 2K + + [Fe(CN) 6 ] 4– 
2K + Ca 2+ [Fe(CN) 6 ] ↓ (white).
3Zn 2+ + 2K + + 2[Fe(CN) 6 ] 4– 
K 2 Zn 3 [Fe(CN) 6 ] 2 ↓ (white/bluish-white).
Fe 3+ + [Fe(CN) 6 ] 4– 
Fe 4 [Fe(CN) 6 ] 3 (prussian blue).
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