1. Tardigrade
  2. Question
  3. Chemistry
  4. For the given aqueous reactions, which of the statement(s) is (are) true? excess KI + K3 [Fe(CN)6] ->[ textdilute H2SO4] brownish - yellow solution ->[ZnSO4] white precipitate + underbrace textbrownish - yellow filtrate ->[Na2S2O3] colourless solution

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

excess $KI + K_3 [Fe(CN)_6] \ce{->[\text{dilute} H_2SO_4]}$ brownish - yellow solution $ \ce{->[ZnSO_4]}$ white precipitate $+ \underbrace{\text{brownish - yellow filtrate}} \ce{->[Na_2S_2O_3]}$ colourless solution

AIEEEAIEEE 2012

Solution:

$K_3[\overset{+3}{Fe}(CN)_6] + KI$(excess)$ \to K_4[\overset{+2}{Fe}(CN)_6] + \underset{\text{Brownish yellow solution}}{KI_3} $(redox reaction )

$\underset{\text{(Brownish yellow filtrate)}}{I_3^-} + 2Na_2S_2O_3 \to \underset{\text{Clear solution}}{Na_2S_4O_6} ++ 2NaI + I^-$

$K_4[Fe(CN)_6] + ZnSO_4 \to \underset{\text{(white ppt.}}{K_3Zn_3[Fe(CN)_6]_3} \ce{->[NaOH]} \underset{\text{soluble}}{Na_2[Zn(OH)_4]}$