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Question
Which of the following characteristics of transition metals is associated with their catalytic activity?
Options
Paramagnetic nature
Colour of hydrated ions
High enthalpy of atomisation
Variable oxidation states
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Solution
Variable oxidation states
Explanation:
Transition metals have a tendency to have varying oxidation states, which allows them to create unstable intermediates and provide a novel reaction path with a lower Ea. As a result, transition metals have catalytic activity.
RELATED QUESTIONS
How would you account for the following?
Transition metals exhibit variable oxidation states.
Account for the following:
Cr2+ is a strong reducing agent.
|
`E_((M^(2+)/M)` |
Cr | Mn | Fe | Co | Ni | Cu |
| -0.91 | -1.18 | -0.44 | -0.28 | -0.25 | -0.34 |
From the given data of E0 values, answer the following questions :
(1) Why is `E_(((Cu^(2+))/(Cu)))` value exceptionally positive
(2) Why is `E_(((Mn^(2+))/(Mn)))` value is highly negative as compared to other elements
(3) Which is the stronger reducing agents Cr2+ or Fe2+ ? Give Reason.
An analysis shows that FeO has a non-stoichiometric composition with formula Fe0.95O. Give reason.
Give reasons Iron has the higher enthalpy of atomization than that of copper.
Give reasons for the following:
The transition metals generally form coloured compounds.
The magnetic nature of elements depends on the presence of unpaired electrons. Identify the configuration of transition element, which shows highest magnetic moment.
Mention any three processes where transition metals act as catalysts.
Why are all copper halides known except that copper iodide?
The E° value for the Mn2+/Mn2+ couple is more positive than that of Cr3+/Cr2+ or Fe3+/Fe2+ due to the change of:
