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

Assertion: The metals of 4d and 5d greater entalpies 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 (A) and (R) are correct and (R) is the correct explanation of (A).

B

If both (A) and (R) are correct, but (R) is not the correct explanation of (A).

C

If (A) is correct, but (R) is incorrect.

D

If (A) is incorrect but (R) is correct.

Text Solution

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The correct Answer is:
a
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CENGAGE CHEMISTRY-D AND F BLOCK ELEMENTS-Exercises Assertion Reasoning
  1. Assertion: The second ionisation energies of V, Cr and Mn are in the o...

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  2. Assertion: The metals of 4d and 5d greater entalpies of atomisation th...

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  3. Assertion: Mercuryis not considered as a transition element. Reason:...

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

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  5. Assertion: Cu, Ag and Au lie in Group 11 of the periodic table. Hence ...

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

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  7. Assertion: Tungsten has very high melting point. Reason: Tungsten is...

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  8. Assertion: Manganese shows a number of oxidation states. Reason: The...

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  9. Assertion: Equivalent mass of KMnO4 is same in the neutral as well as ...

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  10. Assertion: In Cr2O7^(2-) ion, all the Cr-O bond lengths are equal. R...

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

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

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  13. Assertion: Ce^(4+) is used as an oxidising agent in volumetric analysi...

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  14. Assertion: Mn atom loses ns electrons first during ionisation as compa...

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  15. Assertion: Actinoids show greater number of oxidation states than lant...

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  16. Assertion: E^(ɵ) for (Mn^(3+))/(Mn^(2+)) is more positive than for (Cr...

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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: An aqueous solution of FeCl3 is acidic. Reason: It is due...

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  19. Assertion: La should be the f-block element according to Aufbau princi...

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  20. Assertion: Mercurous compounds are diamagnetic. Reason: Two Hg^(o+) ...

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