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प्रश्न
Which of the following characteristics of transition metals is associated with their catalytic activity?
पर्याय
Paramagnetic nature
Colour of hydrated ions
High enthalpy of atomisation
Variable oxidation states
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उत्तर
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.
संबंधित प्रश्न
Account for the following:
Cu+2 salts are coloured, while Zn2+ salts are white.
|
`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.
Which of the d-block elements may not be regarded as the transition elements?
In lake test for Al3+ ions, there is the formation of coloured ‘floating lake’. It is due to ______.
The second and third rows of transition elements resemble each other much more than they resemble the first row. Explain why?
Assertion (A): Cu cannot liberate hydrogen from acids.
Reason (R): Because it has positive electrode potential.
Account for the following:
In case of transition elements, ions of the same charge in a given series show progressive decrease in radius with increasing atomic number.
Which of the following transition metals shows +1 and +2 oxidation states?
Account for the following:
Zirconium (Zr) and Hafnium (Hf) are difficult to separate.
Give a reason for the following.
Some transition metals and their compounds get attracted towards the magnetic field.
