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प्रश्न
Assertion (A): Transition metals have high enthalpy of atomisation.
Reason (R): Greater number of unpaired electrons in transition metals results in weak metallic bonding.
विकल्प
Both (A) and (R) are true and (R) is the correct explanation of (A).
Both (A) and (R) are true, but (R) is not the correct explanation of (A).
(A) is true, but (R) is false.
(A) is false, but (R) is true.
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उत्तर
(A) is true, but (R) is false.
Explanation:
The assertion (A) is true: Transition metals exhibit a high enthalpy of atomization. This is owing to the strong metallic bonds found in these metals.
The reasoning (R) is false: The existence of unpaired electrons in transition metals causes stronger, rather than weaker, metallic bonding. The delocalization of d and s electrons across the metal lattice helps to form strong metallic connections.
APPEARS IN
संबंधित प्रश्न
Account for the following:
Zn is not considered as a transition element.
Which is a stronger reducing agent, Cr2+ or Fe2+ and why?
Why does the density of transition elements increase from Titanium to Copper? (at. no. Ti = 22, Cu = 29)
Transition metals with lowest melting point is ______.
Why EΘ values for Mn, Ni and Zn are more negative than expected?
Match the properties given in Column I with the metals given in Column II.
| Column I (Property) | Column II (Metal) | |
| (i) | Element with highest second ionisation enthalpy |
(a) \[\ce{Co}\] |
| (ii) | Element with highest third ionisation enthalpy |
(b) \[\ce{Cr}\] |
| (iii) | \[\ce{M}\] in \[\ce{M(CO)6}\] is | (c) \[\ce{Cu}\] |
| (iv) | Element with highest heat of atomisation |
(d) \[\ce{Zn}\] |
| (e) \[\ce{Ni}\] |
Give reason for the following statement:
Physical and chemical properties of the 4d and 5d series of the transition elements are quite similar to expected.
Give a reason for the following.
Some transition metals and their compounds get attracted towards the magnetic field.
Compare the general characteristics of the first series of the transition metals with those of the second and third series metals in the respective vertical columns. Give special emphasis on the following point:
Ionisation enthalpies
Compare the general characteristics of the first series of the transition metals with those of the second and third series metals in the respective vertical columns. Give special emphasis on the following point:
Atomic sizes
