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Assertion: Every 4th layer is identical ...

Assertion: Every 4th layer is identical to first layer in ccp pattern of three dimension arrangement
Reason: ABCABC…. Arrangement is present in ccp

A

If both assertion and reason are correct and reason is correct explanation for assertion

B

If both assertion and reason are correct but reason is not correct explanation for assertion

C

If assertion is correct but reason is incorrect

D

If both assertion and reason are incorrect

Text Solution

Verified by Experts

The correct Answer is:
A
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All real structures are three dimensional structures. They can be obtained by stacking two dimensional layers one above the other while placing the second square dose packed layer above the first we follow the same rule that was followed when one row was placed adjacent to the other. The second layer is placed over the first layer such that the spheres of the upper layer are exactly above there of the first layer. In his arrangement spheres of both the layers are perfectly aligned horizontally as well as vertically. A metallic element crystallise into a lattice having a ABC ABC pattern and packing of spheres leaves out voids in the lattice. Which of the following statements not true for the amorphous and crystalline solids?

All real structures are three dimensional structures. They can be obtained by stacking two dimensional layers one above the other while placing the second square dose packed layer above the first we follow the same rule that was followed when one row was placed adjacent to the other. The second layer is placed over the first layer such that the spheres of the upper layer are exactly above there of the first layer. In his arrangement spheres of both the layers are perfectly aligned horizontally as well as vertically. A metallic element crystallise into a lattice having a ABC ABC pattern and packing of spheres leaves out voids in the lattice. Which of the following statements is not true for unit cell?

Statement-1:In a hexagonal close packing , third layer is identical to first layer. Statement-2: In a primitive unit-cell, the third nearest neighbours of an atom located at a corner are at the other end of face-diagonal. Statement-3: If the radius of cation is nearly equal to radius of anions, then most favourable arrangement is BCC.

DINESH PUBLICATION-SOLID STATE-A.R
  1. Assertion: Crystalline solids are anisotropic. Reason: Cystalline so...

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  2. Assertion: In a crystal, the size of the cation is larger in a tetrahe...

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  3. Assertion: In a close packing of spheres, a tetrahedral void is surrou...

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  4. Assertion :In NaCIcrystal each Na^(+) ion is tourching 6 CI^(-) ion bu...

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  5. Statement : Due to Frenkel defect the density of the crystalline solid...

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  6. Assertion : On heating ferromagnetic or ferromagnetic substance , the...

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  7. Assertion (A) : The electrical conductivity of a semiconductor increas...

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  8. Assertion (A) : Group-13-doped crystals of Si are called p-type semico...

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  9. Assertion (A) : Graphite is an example of tetragonal crystal system. ...

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  10. Band gap in germanium is small. The energy spread of each germanium ...

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  11. STATEMENT -1 : In NaCl structure , Na^(+) ion occupy octahedral hole...

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  12. Assertion: In the body centred cubic structure of CsCl the arrangement...

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  13. Assertion: Diamond has a ccp arrangement in which corners, face centre...

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  14. Assertion: Metals are generally good conductors of electricity Reas...

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  15. Assertion: p-type semiconductors are good conductors of electricity du...

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  16. Assertion: Increase in dielectric constant is observed for crystals ha...

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  17. Assertion: Every 4th layer is identical to first layer in ccp pattern ...

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  18. Assertion: bcc and hcp have same packing efficiency Reason: Both hav...

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  19. Assertion : The number of tetrahedral voids is double the number of oc...

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  20. Assertion: Metal dificiency defect can be seen in FeO. Reason: Li co...

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