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Fe(3)O(4) is ferrimagnetic at room tempe...

`Fe_(3)O_(4)` is ferrimagnetic at room temperature but at 850K it becomes::

A

diamagnetic

B

ferromagnetic

C

non-magnetic

D

paramagnetic

Text Solution

Verified by Experts

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

Assertion : Fe_(3)O_(4) is paramagnetic at room temperature and becomes ferromagnetic at 850 K Reason : The randomization of spin takes place with temperature.

For the Daniell cell Zn| Zn^(2+) || Cu^(2+) | Cu with The questions consist of two statements each, printed as Assertion and Reason. While answering these questions you are required to choose any one of the following four responses : Fe_3O_4 is paramagnetic at room temperature and becomes ferromagnetic at 850 K . The randomization of spin takes place whith temperature.

Assertion:Substances like Fe_3O_4 and MgFe_2O_4 lose ferrimagnetism on heating and become paramagnetic Reason : Magnetic moments of the domains in these substances are aligned in parallel and antiparallel directions in unequal numbers.

Cabon cannot reduce Fe_(2)O_(3) to Fe at a temperature below 983K because.

1 mole of Fe_(2)O_(3) and 2 mole of Al are mixed at temperature 25^(@)C and the reaction is completedto give: Fe_(2)O_(3)(s)+2Al(s)toAl_(2)O_(3)(s)+2Fe(l),DeltaH=-850kJ The liberated heat is retained within the products, whose combined specific heat over a wide temperature range is about 0.8Jg^(-1)K^(-1) . The melting point of iron is 1530^(@)C . Show that the quantity of heat liberated is sufficient to raise the temperature of the product to the melting point of iron in order to get it welded.

Consider the following statements I. Fe, Co, Ni CrO_2 are ferrimagnetic substances . II. MnO is ferrimagnetic in nature III. H_2O , NaCl are paramagnetic in nature MgFe_2O_4 " and " ZnFe_2O_4 are antiferromagnetic in nature Which of the above statements are true ?

MODERN PUBLICATION-SOLID STATE-REVISION EXERCISES (OBJECTIVE QUESTIONS) (MULTIPLE CHOICE QUESTIONS)
  1. Which of the following is not an example of 13-15 commpound ?

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  2. If the alignment of magnetic moments in a subtance is in a compensator...

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  3. Fe(3)O(4) is ferrimagnetic at room temperature but at 850K it becomes:...

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  4. The appearance of colour in solid alkali metal halides is generally du...

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  5. An example of a ferromagnetic oxide is

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  6. Close packing is maximum in the crystal lattice of :

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  7. In a solid lattice the cation has left a lattice sirte and is located ...

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  8. The coordination number of a metal crystallizing in a hexagonal close-...

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  9. In a body centred unit cell, the number of atoms present is

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  10. In a trigonal crystal

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  11. The appearance of colour in solid alkali metal halides is generally du...

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  12. In a body centred cubic structure, the space occupied is about

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  13. Some polar crystals when heated produce small electrical current. The ...

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  14. The empty space within hcp arrangment is

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  15. The crystal system in which a ne b ne c and the angles alpha ne beta n...

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  16. The number of Cl^(-) ions present around each Na^(+) ion in NaCl cryst...

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  17. To get a n- type semiconductor from silicon , it should be doped...

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  18. The fraction of volume occupied by atoms in a face centered cubic unit...

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  19. The percentage of empty space in a body centred cubic arrangement is :

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  20. To get p-type semiconductor , impurity to be added to silicon should h...

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