First slide

Transition elements

Question

Select the correct statements:

Moderate

A

${MnO}_{2} dissolves in conc. HCl but does not form {Mn}^{4 +} ion$
B

${MnO}_{4}^{2 -} is strongly oxidizing and stable only in very strong alkali.$
C

${KMnO}_{4} does not act as oxidrzingagent in basic medium$
D

Decomposition of acidic KMnO₄ is not catalysed by sunlight.

Solution

$(1) {MnO}_{2} + 4 HCl ⟶ Mn {Cl}_{2} + {Cl}_{2} + 2 H_{2} O$

It dilute alkali, water or acidic solution ${MnO}_{4}^{2 -}$ dirptoportionate also Correct (3)
${MnO}_{4}^{⊖} acts as an oxidizing agent in basic medium.$
${MnO}_{4}^{⊖} + 2 H_{2} O + 3 e^{-} ⟶ {MnO}_{2} + 4 {OH}^{⊖}$
$E^{\circ} = 1 .23 V$
Correct (4)
Decomposition of acidic KMnO₄ is catalyzed by sunlight
$4 {MnO}_{4}^{⊖} + 4 H^{\oplus} ⟶ 4 {MnO}_{2} + 2 H_{2} O + 3 O_{2}$

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