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Assertion: The metals of 4d and 5d great...

Assertion: The metals of 4d and 5d greater enthalpies of atomisation than the corresponding elements of the 3d series.
Reason: The metal-metal bond in 4d and 5d series are stronger than those in the 3d series.

A

If both assetion and reason are true and the reason is the correct explanation of the assertion.

B

If both assertion and reason are ture but reason is not the correct explanation of the assertion.

C

If assertion is true but reason is false.

D

If assertion is false but reason is true.

Text Solution

Verified by Experts

The correct Answer is:
A
Reason is the correct explanatin is assertion.
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A2Z-THE D AND F BLOCK ELEMENTS-Section B - Assertion Reasoning
  1. Assertion : The free gases Cr atom has six unpaired electrons. Half-...

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  2. Assertion: Tt^(3+) salts are coloured whereas Ti^(4+) salts are white....

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  3. Assertion: The metals of 4d and 5d greater enthalpies of atomisation t...

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  4. Assertion : Potassium dichromates gives deep red vapours with concentr...

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  5. Assertion : Manganese show a maximum oxidation state of + 5. Reason ...

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  6. Assertion: MnO is basic whereas Mn2O7 is acidic. Reason: Higher the ...

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  7. Assetion : Ce^(3+) is used as an oxidizing in volumetric analysis. R...

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  8. Assertion : The number of unpaired electrons in the following gaseous ...

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  9. Assertion : Lanthanoids show a limited of ixidation states wheres acta...

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  10. Assertion : The highest manganese fluroide is MnF(4) and the highest o...

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  11. Assertion: Mercury is not considered as a transition element. Reason...

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  12. Assertion: In any transition series the magnetic moment of M^(2+) ions...

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  13. Assertion : Silver intrate is reduced to silver by the hydrides of 15t...

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  14. Assertion : Ag(2) S + 4 KCN 2K [Ag(CN)(2)] + K(2) s Reason : The rea...

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  15. Assertion: K2Cr2O7 is used as primary standard in volumetric analysis....

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  16. Assertion : The value of enthaply of atomisation is maximum at about t...

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  17. Assertion: The spin only magnetic moment of Sc^(3+) is 1.73 BM. Reas...

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  18. Assertion : Hydrochloric acid is not used to acidify a KMnO(4) solutio...

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  19. Assertion : Solution of Na(2) CrO(4) in water is intensely electrons. ...

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  20. Assertion : Reaction of thionyl chloride with hydrated ferric chloride...

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