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(A) Packing efficiency of hep and CCP ar...

(A) Packing efficiency of hep and CCP are not equal (R) hep, ccp both have ABC ABC type packing

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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The correct Answer is:
D
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The packing efficiency of simple cubic (sc.) body centred cubic (bcc) and cubic close packing (ccp) lattices follow the order

Packing refers to the arrangement of constituent units in such a way that the forces of attraction among the constituent particles is maximum and the constituents occupy the maximum available space. In two dimension there are square close packing and hexagonal close packing, cubic close packing and body-centred cubic packing i) hcp: AB AB AB AB .... arrangement Coordination no. = 12 , % occupied space = 74% ii) ccp: ABC ABC ....... arrangement Coordination no. = 12, % occupied space = 74% iii) bec: 68% space is occupied. Coordination no= 8 17. The empty space left in hcp in three dimensions is

Packing refers to the arrangement of constituent units in such a way that the forces of attraction among the constituent particles is maximum and the constituents occupy the maximum available space. In two dimension there are square close packing and hexagonal close packing, cubic close packing and body-centred cubic packing i) hcp: AB AB AB AB .... arrangement Coordination no. = 12 , % occupied space = 74% ii) ccp: ABC ABC ....... arrangement Coordination no. = 12, % occupied space = 74% iii) bec: 68% space is occupied. Coordination no= 8 17. The pattern of successive layers of cop arrange-ment can be designated as

Distinguish between hep and ccp lattices with suitable examples.

Classify the following triangles according to their (i) sides and (ii) angles. (2) Write the six elements (i.e. the 3 sides and 3 angles) of Delta ABC . (3) Write the side opposite to vertex Q in Delta PQR . (4) Write the angle opposite to side bar(LM) in Delta LMN . (5) Write the vertex opposite to side bar(RT) in Delta RST . If we consider triangles in terms of both sides and angles we can have the following types of triangles:

If R is the radius of the octahedral void and r is the radius of the atom in close packing, then r/R is equal to

O is the circumcentre of the triangle ABC and R_(1), R_(2), R_(3) are the radii of the circumcircles of the triangles OBC, OCA and OAB respectively, then a/R_(1) + b/R_(2) + c/R_(3) is equal to

Assertion (A) : The radius of the circle inscribed in the triangle obtained by joining the middle points of the sides of Delta ABC is equal to half the radius of incircle of Delta ABC Reason (R ) : In Delta ABC, D,E,F be midpoints of the sides of Delta ABC , Delta ' , 2s' denotes area and perimeter of Delta DEF " then " Delta ' = Delta//4 and s' =s//2

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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