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(A) Diamond and graphite are polymorphic...

(A) Diamond and graphite are polymorphic forms (R) Carbon adopts different structural arrange­ments under different conditions to give these two forms.

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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Carbon shows allotropy. The various allotropic forms of carbon can be broadly classified into 2 classes a) Crystalline form b) Amphorous form Diamond and Graphite are the 2 crystalline forms of carbon. In diamond, the carbon atoms are arranged tetrahedrally while in graphite, the carbon atoms are arranged inregular hexagons in flat parallel layers When diamond is heated at 1800 to 2000^(@)C in valency. It is converted into

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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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