Which of the following oxidation reactions are carried out by both K 2 Cr 2 O 7 and KMnO 4 in acidic medium? [2025]

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Q.
Which of the following oxidation reactions are carried out by both $K_{2} {Cr}_{2} O_{7}$ and ${KMnO}_{4}$ in acidic medium [2025]

(A)   $I^{-} \to I_{2}$

(B)    $S^{2 -} \to S$

(C)   ${Fe}^{2 +} \to {Fe}^{3 +}$

(D)   $I^{-} \to {IO}_{3}^{-}$

(E)   $S_{2} O_{3}^{2 -} \to {SO}_{4}^{2 -}$

Choose the correct answer from the options given below:

1 (C), (D) and (E) only

2 (A), (B) and (C) only

3 (B), (C) and (D) only

4 (A), (D) and (E) only

Ans.
(2)

Reactant Product with acidic ${KMnO}_{4}$ Product with faintly alkaline ${KMnO}_{4}$ Product with acidic $K_{2} {Cr}_{2} O_{7}$

$I^{-}$ $I_{2}$ ${IO}_{3}^{-}$ $I_{2}$

$S^{2 -}$ $S$ $S$ $S$

${Fe}^{2 +}$ ${Fe}^{3 +}$ ${Fe}^{3 +}$ ${Fe}^{3 +}$

$S_{2} O_{3}^{2 -}$ ${SO}_{4}^{2 -} + S$ ${SO}_{4}^{2 -}$ ${SO}_{4}^{2 -} + S$

Solution

1 (C), (D) and (E) only

2 (A), (B) and (C) only

3 (B), (C) and (D) only

4 (A), (D) and (E) only

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Reactant	Product with acidic ${KMnO}_{4}$	Product with faintly alkaline ${KMnO}_{4}$	Product with acidic $K_{2} {Cr}_{2} O_{7}$
$I^{-}$	$I_{2}$	${IO}_{3}^{-}$	$I_{2}$
$S^{2 -}$	$S$	$S$	$S$
${Fe}^{2 +}$	${Fe}^{3 +}$	${Fe}^{3 +}$	${Fe}^{3 +}$
$S_{2} O_{3}^{2 -}$	${SO}_{4}^{2 -} + S$	${SO}_{4}^{2 -}$	${SO}_{4}^{2 -} + S$

Solution

Q. Which of the following oxidation reactions are carried out by both K2Cr2O7 and KMnO4 in acidic medium [2025] (A) I-→I2 (B) S2-→S (C) Fe2+→Fe3+ (D) I-→IO3- (E) S2O32-→SO42- Choose the correct answer from the options given below:

1 (C), (D) and (E) only

2 (A), (B) and (C) only

3 (B), (C) and (D) only

4 (A), (D) and (E) only

Ans. (2) Reactant Product with acidic KMnO4 Product with faintly alkaline KMnO4 Product with acidic K2Cr2O7 I- I2 IO3- I2 S2- S S S Fe2+ Fe3+ Fe3+ Fe3+ S2O32- SO42-+S SO42- SO42-+S

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