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Which of the following statements regarding the catalytic properties of transition metals are CORRECT?

(1) Transition metal ions can change their oxidation states, hence they are effective as catalysts.

(2) They are good catalysts because of lower valencies due to which they sometimes form an unstable intermediary and hence a new path with lower activation energy

(3) Transition metal catalysts are always heterogeneous catalysts where the catalyst and reactants are in different phases.

(4) In some cases transition metals provide a suitable surface for adsorption which weakens the bond between reactant molecules making them good catalysts

$\begin{array}{1 1} All \;are\;correct \\(1), (2) \;and\; (4)\; are\; correct \\ (2), (3) \;and\; (4)\; are\; correct \\ (1), (2) \;and\; (3) \;are\; correct \end{array}$

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Answer: (1), (2) and (4) are correct
(3) is incorrect. Here is an example of Homogeneous reaction where the catalyst is in the same physical phase as the other reactants.
Persulphate ions,oxidise iodide ions but since the reaction occurs slowly at room temperature Iron (II) is used as a catalyst.
Step-1: $ 2Fe^{2+} (aq) + S_2O_8^{2-} (aq) \rightarrow 2SO_4^{2-} (aq) + 2Fe^{3+} (aq)$
Step-2: $2Fe^{3+}(aq) + 2I^{-}(aq) 2Fe^{2+}(aq) + I_2(aq)$
answered Jan 29, 2014 by sreemathi.v
edited Aug 4, 2014 by balaji.thirumalai

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