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Assertion : E^(@)" for"Mn^(3+)//Mn^(2+) ...

Assertion : `E^(@)" for"Mn^(3+)//Mn^(2+)` is more positve than `Cr^(3+)//Cr^(2+)`.
Reason : The third ionization energy of Mn is larger than that of Cr.

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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Assertion: E^(@) for Mn^(3+)//Mn^(2+) is more positive than Cr^(3+)//Cr^(2+) Reason: The third ionisation energy of Mn is larger than that of Cr .

Explain why E^(@) for Mn^(3+)//Mn^(2+) couple is more positive than that for Fe^(3+)//Fe^(2+) (At. Nos. Mn=25,Fe=26)?

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Assign reasons for the following : (i) The enthalpies of atomisation of transition elements are high. (ii) The transition metals and many of their compounds act as good catalyst. (iii) From element to element the actinoid contraction is greater than the lanthanoid contraction. (iv) The E^(@) value for the Mn^(3+)//Mn^(2+) couple is much more positive than that for Cr^(3+)//Cr^(2+) . (v) Scandium (Z = 21) does not exhibit variable oxidation states and yet it is regarded as transition element.

Account for the fact that the third ionization enthalpies of both Mn and Zn are higher than those of next element

Assertion : Cr^(2+) is reducing and Mn^(3+) is oxidising. Reason : Cr^(2+) and Mn^(3+) have d^4 configuration.

Assertion : Magnetic moment of Mn^(2+) is less than Cr^(2+) Reason: Higher the atomic number smaller is the magnetic moment.

How would you account for the following? (i)The atomic radii of the metals of the third (5d) series of transition elements are virtually the same as those of the corresponding members of the second (4d) series. (ii)The E^(@) value for the Mn^(3+)//Mn^(2+) couple is much more positive than that for Cr^(3+)//Cr^(2+) couple or Fe^(3+)//Fe^(2+) couple. (iii)The highest oxidation state of a metal is exhibited in its oxide or fluoride.

Assertion : Out of CrO_(3)& Al_(2)O_(3), CrO_(3) having lower melting point than Al_(2)O_(3) . Reason: Oxidation state of Cr in CrO_(3) is high

Assertion :- Cr^(+2) is a reducing agent and Mn^(+3) is oxidising agent. Reason :- Mn^(+3) has d^(5) configuration.

CENGAGE CHEMISTRY ENGLISH-D AND F BLOCK ELEMENTS-Exercises Assertion Reasoning
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  2. Metal-metal bonding is more frequent in 4d or 5d series than in 3d ser...

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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 : K(2)Cr(2)O(7) is used as primary standard in volumetric an...

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  7. Statement-1: Tungsten has very high melting point Statament-2: Tungs...

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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+) io...

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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 analys...

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  14. Statament-1: Mn atom loses ns electrons first during ionisation as co...

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

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  16. Assertion : E^(@)" for"Mn^(3+)//Mn^(2+) is more positve than Cr^(3+)//...

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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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