Which of the following conversions can be carried out by both acidified K2Cr2O4 and acidified KMnO4? (i) Fe2+ → Fe3+ + e- (ii) I- → (iii) I- → I2 (iv) H2S → S

Question

Which of the following conversions can be carried out by both acidified K2Cr2O4 and acidified KMnO4? (i) Fe2+ → Fe3+ + e- (ii) I- → (iii) I- → I2 (iv) H2S → S (A) (i) and (iii) (B) (ii) and (iv) (C) (i), (iii) and (iv) (D) (i), (ii) and (iii)

Tardigrade Admin · Accepted Answer

I -is converted to IO 3-by neutral or faintly alkaline MnO 4-as shown below. 2 MnO 4-+ H 2 O + I - longrightarrow 2 MnO 2+2 OH -+ IO 3-

Q. Which of the following conversions can be carried out by both acidified $K_{2} C r_{2} O_{4}$ and acidified $K M n O_{4}$ ?
(i) $F e^{2 +} \to F e^{3 +} + e^{-}$
(ii) $I^{-} \to$
(iii) $I^{-} \to I_{2}$
(iv) $H_{2} S \to S$

(i) and (iii)

(ii) and (iv)

(i), (iii) and (iv)

(i), (ii) and (iii)

$I^{-}$ is converted to $I O_{3}^{-}$ by neutral or faintly alkaline $M n O_{4}^{-}$ as shown below.
$2 M n O_{4}^{-} + H_{2} O + I^{-} ⟶ 2 M n O_{2} + 2 O H^{-} + I O_{3}^{-}$

Q. Which of the following conversions can be carried out by both acidified K2​Cr2​O4​ and acidified KMnO4​? (i) Fe2+→Fe3++e− (ii) I−→ (iii) I−→I2​ (iv) H2​S→S