For the given aqueous reactions, which of the statement(s) is (are) true?

Engineering

Chemistry

Test of Cations and Anions

Question

The first reaction is a redox reaction

White precipitate is Zn₃[Fe(CN)₆]₂

Addition of filtrate to starch solution gives blue colour

White precipitate is soluble in NaOH solution.

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3KI + K₃ [Fe(CN)₆] $\to_{}^{}$ KI₃ + K₄[Fe(CN)₆]

(brownish yellow)

3Zn²⁺ + 2K⁺ + 2[Fe(CN)₆]^4– $\to_{}^{}$ K₂Zn₃[Fe(CN)₆]₂ (white ppt)

KI₃ will remain unreacted

KI₃ + 2Na₂S₂O₃ $\to_{}^{}$ 2NaI + KI + Na₂S₄O₆

K₂Zn₃ [Fe(CN)₆]₂ + 12OH^– $\to_{}^{}$ 2[Fe(CN)₆]^4– + [Zn(OH)₄]^2– + 2K⁺

Starch + KI₃ $\to$ Starch – Iodine complex (blue colour)