Ncert Exercises & Solutions

1. Transition metals can act as catalysts because these can change their oxidation state. How does Fe (III) catalyse the reaction between iodide and persulphate ions?

2. Mention any three processes where transition metals act as catalysts.

NEETprep Answer: (a) Reaction between iodide and persulphate ions is

2 I^{-} + S_{2} O_{8}^{2} \overset{F e (l l l)}{\to} l_{2} + 2 S O_{4}^{2 -}

R o l e o f F e (l l l) i o n s 2 F e^{3 +} + 2 l^{-} \to 2 F e^{2 +} + l_{2}

2 F e^{2 +} + S_{2} O_{8}^{2 -} \to 2 F e^{3 +} + 2 S O_{4}^{2 -}

(b) (i) Vanadium (V) oxide used in contact process for oxidation of

S O_{2} t o S O_{3}

(ii) Finely divide iron in Haber's process in conversion of

N_{2} a n d H_{2} t o N H_{3} .

(iii)

M n O_{2}

in preparation of oxygen from

K C I O_{3} .

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