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Salt of Weak Acid and Weak Base

The sequentia...

Question

The sequential unknown reagents is/are:

H_{2} O_{2}

/neutral medium,

H_{2} O_{2} / H^{+}, C u^{2 +}

salt solution

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H_{2} O_{2} / H^{+}, H_{2} O_{2} / O H^{-}, F e^{3 +}

salt solution

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H_{2} O_{2} / O H^{-}, H_{2} O_{2} / H^{+}, C o^{2 +}

salt solution

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H_{2} O_{2}

/neutral medium,

H_{2} O_{2} / O H^{-}, F e^{2 +}

salt solution

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Solution

The correct option is D $H_{2} O_{2} / H^{+}, H_{2} O_{2} / O H^{-}, F e^{3 +}$ salt solution
Acidic $H_{2} O_{2} / H^{+}$ generates yellow solution which will be generated back to pale yellow solution by basic $H_{2} O_{2} / O H^{-}$ medium.
$4 F e^{3 +} + 3 [F e (C N)_{6}]^{4 -} ⟶ F e_{4} [F e (C N)_{6}]_{3} ↓$

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