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Substance which is weakly repelled by a...

Substance which is weakly repelled by a magnetic field is

A

`O_2`

B

`H_2O`

C

`CrO_2`

D

`Fe_3 O_4`

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The correct Answer is:
B
Substances which are weakly repelled by external magnetic field are called diamagnetic substances, e.g. `H_2O`.
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The substances which contain species with unpaired electrons in their orbitals behave as paramagnetic sustances. 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 tot he following relation: Magnetic moment mu=sqrt(n(n+2))BM where n=number of unpaired electrons. BM stands for Bohr magneton, a unit of magnetic moment. 1BM=(eh)/(4pimc)=9.27xx10^(-24)Am^(2) or JT^(-1) Q. In Which of these options do both constituents of the pair have the same magnetic moment?

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ERRORLESS-CHEMICAL BONDING AND MOLECULAR STRUCTURE-NCERT BASED QUESTIONS (Molecular Orbital Theory)
  1. According to molecular orbital theory, the paramagnetism of O(2) molec...

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  2. Which of the following is paramagnetic

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  3. Which of the following molecules/ins does not contain unpaired electro...

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  4. Using MOT, compare O2^(+) and O2^(-) species and choose the incorrect ...

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  5. Which one of the following oxides is expected to exhibit paramagnetic ...

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  6. N2 and O2 are converted into monoanions N2^- and O2^- respectively. Wh...

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  7. Which one does not exhibit paramagnetism

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  8. Substance which is weakly repelled by a magnetic field is

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  9. Bond energies in NO,NO^(+) and NO^(-) are such as

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  10. Which of the following order of energies of moleuclar orbitals of N...

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  11. Which of the following statement is not correct from the view point of...

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  12. Arrange the following ions in the order of decreasing X-O bond length ...

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  13. The correct order of O-O bond length in O2,H2 O and O3.

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  14. The correct order of increasing C - O bond length CO, CO3^(2-) , CO2 i...

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  15. The bond order of super oxide ion O2^(2-) is

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  16. Among the following, the species with the highest bond order is-

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  17. The correct order of increasing C-O bond lengths in CO, CO3^(2-) and ...

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  18. The diamagnetic species is

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  19. In which of the following processes, the bond order has increased and ...

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  20. During the change of O(2) to O(2)^(-), the incoming electron goes to t...

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