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(A) All types of magnetic solids become ...

(A) All types of magnetic solids become paramagnetic at elevated temperatures. (R) Magnetic solids on heating attains randomisation of spins

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

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A
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Magnetically ordered solids transform to paramagnetic state upon heating. Explain.

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At w hich tem perature, Fe_(3)O_(4) is a fe rri­magnetic solid converted to a paramagnetic solid ?

The behaviour of an electron in an atom is described mathematically by a wave function, or orbital. Spin of the electron produce angular momentum equal to S= sqrt(s(s+1)) (h)/(2pi) where S= +1/2 . Total spin of an atom =+ n/2 or h/2 Where n is the number of unpaired electron. The substance which contain species with unpaired electrons in their orbitals behave as paramagnetic substances. The paramagnetism is expressed in terms of magnetic moment the magnetic moment of an atom mu_s sqrt(s(s+1)) (eh)/(2pi mc) = sqrt((n/2)(n/2+1)) (eh)/(2pi mc) s = n/2 implies mu_s = sqrt(n(n+2)) B.M n = number of unpaired electrons 1 B.M. (Bohr magneton) = (eh)/(4pi mc) If magnetic moment is zero the substances is di-magnetic. Which of the following ion has lowest magnetic moement.

The behaviour of an electron in an atom is described mathematically by a wave function, or orbital. Spin of the electron produce angular momentum equal to S= sqrt(s(s+1)) (h)/(2pi) where S= +1/2 . Total spin of an atom =+ n/2 or h/2 Where n is the number of unpaired electron. The substance which contain species with unpaired electrons in their orbitals behave as paramagnetic substances. The paramagnetism is expressed in terms of magnetic moment the magnetic moment of an atom mu_s sqrt(s(s+1)) (eh)/(2pi mc) = sqrt((n/2)(n/2+1)) (eh)/(2pi mc) s = n/2 implies mu_s = sqrt(n(n+2)) B.M n = number of unpaired electrons 1 B.M. (Bohr magneton) = (eh)/(4pi mc) If magnetic moment is zero the substances is di-magnetic. If an ion of ""_(25)Mn has a magnetic of 3.873 B.M. Then Mn is in which state.

(A): Fe_(3)O_(4) is ferrimagnetic at room temperature but becomes paramagnetic at 850 K (R): The magnetic moments in Fe_(3)O_(4) ale aligned equally in parallel and antiparallel directions which on heating randomise

(A) : Crystalline solids have sharp and chara cteric melting points. (R) : Crystalline solids have definite heat of fusion.

(A) : Melting of solid causes no change in internal energy. ( R) : Latent heat is the heat required to melt a certain mass of solid.

AAKASH SERIES-SOLID STATE-OBJECTIVE EXERCISE -4
  1. (A) Conductivity of silicon increases by doping it with group-15 eleme...

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  2. (A) Cadmium sulphide is perfectly covalent (R) The difference of elect...

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  3. (A) Crystalline solids are anisotropic in nature (R) Crystalline subs...

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  4. (A) Packing efficiency of hep and CCP are not equal (R) hep, ccp both ...

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  5. (A) Visible light can not be used to study crystals (R) The wave lengt...

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  6. (A) All covalent solids are non conductors (R) Graphite is a ionic so...

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  7. (A) I(2), CO(2) have low melting point (R) I(2), CO(2) have weak disp...

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  8. (A) Metallic solids are electrical and thermal conductors (R) Metallic...

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  9. (A) Orthorhombic crystal system has four Bravis lattices (R) Orthorhom...

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  10. (A) F- centre brings about colour (R) Vacancy with a trapped cation is...

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  11. (A) Zinc oxide is yellow coloured when hot (R) Zinc oxide has metal e...

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  12. (A) : Crystalline solids have sharp and chara cteric melting points. ...

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  13. (A) Diamond and graphite are polymorphic forms (R) Carbon adopts diffe...

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  14. (A) : During vacancy defect the density of solid decreases (R): The ...

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  15. (A) : In many crystal structures of ionic substances cations occupy th...

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  16. (A) Single crystals are formed when the process of crystallization is ...

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  17. (A): Crystalline solids are anisotropic (R): Crystalline solids are ...

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  18. (A) In any ionic solid with Schottky defects the number of positive an...

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  19. (A) Every substance is super conducting at room temperature. (R) A sup...

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  20. (A) All types of magnetic solids become paramagnetic at elevated tempe...

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