Assertion :  The stability of a crystal gets reflected in its melting point.

Reason :  The stability of a crystal depends upon the strength of the interparticle attractive force. The melting point of a solid depends on the strength of the attractive force acting between the constitutent particles.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false

Subtopic:  Introduction & Crystal System |
 87%
From NCERT
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Assertion :  The melting point decreases in the order.
Water > ethyl alcohol > diethylether > methane

Reason : The strength of the intermolecular forces between these molecules follow the order
Water > ethyl alcohol > diethylether > methane

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
Subtopic:  Introduction & Crystal System |
 83%
From NCERT
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A metal crystallizes in two cubic phases, face centred cubic (fcc) and body centred cubic (bcc) whose unit cell length are 3.5 and 3.0 Å respectively. Calculate the ratio of density of fcc and bcc. 

(1) 2.123                                     

 (2) 1.259

(3) 5.124                                       

(4) 3.134

Subtopic:  Density & Packing Fraction |
 80%
From NCERT
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A crystal formula AB3 has A ions at the cube corners and B ions at the edge centers. The coordination numbers of A and B are respectively 

(1) 6 and 6                                                 

(2) 2 and 6

(3) 6 and 2                                                 

(4) 8 and 8

Subtopic:  Density & Packing Fraction |
From NCERT
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A rhombohedral unit cell is shown. What is its volume ?
Side length = a Å.

(1) a33                               

(2) a332

(3) a32                             

(4) a3 32

Subtopic:  Density & Packing Fraction |
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In a face centred cubic arrangement of metallic atoms, what is the relative ratio of the sizes of tetrahedral and octahedral voids ?

(1) 0.543                                   

 

(2) 0.732

(3) 0.414                                   

(4) 0.637

Subtopic:  Voids, Radius Ratio & Coordination Number |
 52%
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Close packing is maximum in the crystal which is-

(1) Simple cube                               

(2) bcc

(3) fcc                                             

(4) None

Subtopic:  Voids, Radius Ratio & Coordination Number |
 88%
From NCERT
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The n of a cubic unit cell is 4. The type of cell as-

(1) Body centred                               

(2) Face centred

(3) Primitive                                     

(4) None of these

Subtopic:  Introduction & Crystal System |
 90%
From NCERT
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Bragg’s equation is-

(1) nλ=2θsinθ                               

(2) nλ=2dsinθ

(3) 2nλ=dsinθ                               

(4) λ=2d/nsinθ

Subtopic:  Imperfections in Solids & Semiconductors |
 85%
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Among the following types of voids, which one is the largest void-

(1) Triangular system                             

(2) Tetragonal system

(3) Monoclinic system                             

(4) Octahedral

Subtopic:  Introduction & Crystal System | Voids, Radius Ratio & Coordination Number | Magnetic Behaviour of an Element/Compound |
 73%
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