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(A): Magnetic moment of Mn^(+2) is 5.8 B...

(A): Magnetic moment of `Mn^(+2)` is 5.8 B.M
(R): `Mn^(+2)` has five unpaired electrons 

A

Both (A) and (R) are true and (R) is the correct explanation of (A)

B

Both (A) and (R) are true and (R) is not the correct explanation of (A)

C

(A) is true but (R) is false

D

Both (A) and (R) are false

Text Solution

Verified by Experts

The correct Answer is:
A
Both (A) and (R) are true and (R) is the correct explanation of (A)
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Magnetic moment of Mn^(+2) is 5.8 B.M. Hence the number of unpaired electrons presenting the metal ion is

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Assertion: The spin only magnetic moment of [MnBr_4]^(2-) is 5.9 BM Reason: [MnBr_4]^(2-) is tetrahedral with sp^3 hybridisation of Mn^(2+) having 3d^5 configuration

The substances which contain species with unpaired electrons in their orbitals behave as paramagnetic substances. Such substances are weakly attracted by the magnetic field. The paramagnetism is expressed in terms of magneticmoment The magnetic moment is related to the number of unpaired electrons according to the following relation : Magnetic moment, mu = sqrt(n(n+2)) B.M. Where ‘n’ = number of unpaired electrons. B.M stands for Bohr magneton, a unit of magnetic moment. Which of the following has the highest magnetic moment ?

A: Oxygen molecule is paramagnetic in nature whose magnetic moment is sqrt(8) BM R: Oxygen molecule has two unpaired electrons in bonding molecular orbitals

The substances which contain species with unpaired electrons in their orbitals behave as paramagnetic substances. Such substances are weakly attracted by the magnetic field. The paramagnetism is expressed in terms of magnetic moment. The magnetic moment is related to the number of unpaired electrons according to the following relation : Magnetic moment, mu = sqrt(n(n+2)) B.M. Where .n. = number of unpaired electrons. B.M. stands for Bohr magneton, a unit of magnetic moment. An ion of a d-block elements has magnetic moment 5.92 B.M. Select the ion among the following.

The substances which contain species with unpaired electrons in their orbitals behave as paramagnetic substances. Such substances are weakly attracted by the magnetic field. The paramagnetism is expressed in terms of magnetic moment. The magnetic moment is related to the number of unpaired electrons according to the following relation : Magnetic moment, mu = sqrt(n(n+2)) B.M. Where .n. = number of unpaired electrons. B.M. stands for Bohr magneton, a unit of magnetic moment. Which of the following is diamagnetic ?

(A) Cr^(+3) and Co^(2+) ions have same number of unpaired electrons but the observed magnetic moment of Cr^(3+) is 3.87 B. M and that of Co^(2+) is 4.87 B.M (R) Due to symmetrica electronic configuration there is no orbital motion of unpaired electron in Cr^(3+) ion while appreciable orbital contribution takes place in Co^(2+) ion .

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AAKASH SERIES-D-BLOCK ELEMENTS-OBJECTIVE EXERCISE-4 (ASSERTION (A) & REASON (R) TYPE QUESTIONS )
  1. (A): Elements of second and third transition series have nearly same a...

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  2. (A) : Transition metals form colored ions (R): They have completely ...

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  3. (A): Magnetic moment of Mn^(+2) is 5.8 B.M (R): Mn^(+2) has five unp...

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  4. (A) : Cu^(+2)(aq) is more stable than Cu^(+)(aq) (R): Heat of hydrat...

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  5. (A): Zn(II) compounds are diamagnetic. (R): Zn(II) has all its elect...

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  6. (A): FeO is basic in character. (R): Oxides of transition metals are...

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  7. (A): Pyrolusite is an ore of manganese. (R) : Formula of pyrolusite ...

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  8. (A): Equivalent mass of K(2)Cr(2)O(7), when it acts as oxidizing agent...

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  9. (A): Ti(IV) in aqueous solutions is colour less. (R): Ti(IV) has no ...

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  10. (A): In alkaline medium, KMnO(4) oxidizes iodides to iodates. (R): K...

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  11. (A): Zr and Hf have nearly equal atomic radii. (R): Zr and Hf belong...

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  12. (A) Scandium is the lightest transition metal, (R) Atomic radius of ...

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  13. (A) The most common oxidation state of lanthanides is + 3. (R) Lanth...

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  14. (A): Ce^(4+) is a good oxidizing agent. (R): Sm^(2+) is a good reduc...

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  15. (A): Zinc does not show characteristic properties of transition metals...

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  16. (A): K(2)CrO(4) has yellow colour due to charge transfer (R) : CrO(4...

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  17. (A) The highest oxidation state of chromium in its compounds is + 6 ...

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  18. (A) CrO3, reacts with HCl to form chromyl chloride gas (R) Chromyl c...

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  19. (A) Tungsten has a very low melting point (R) Tungsten is a covalent...

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  20. (A) Cu^+ ion is coloured in aqueous solutions (R) Four water molecul...

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