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

Engineering

Chemistry

Dilute Hydrochloric Acid and Sulphuric Acid

Question

Addition of filtrate to starch solution gives blue colour

White precipitate is Zn₃[Fe(CN)₆]₂

The first reaction is a redox reaction

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)

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