Question 1 :
Which of the following statements are correct in context of point defects in a crystal ?<br>
Question 3 :
copper crystallises in fcc with a unit cell length of 361 pm. What is the radius of copper atom ?
Question 4 :
In $sc, bcc$ and $fcc$ the ratio of number of atoms per unit cell is given by:
Question 5 :
Zinc Oxide, white in colour at room temperature, acquires yellow colour on heating due to:<br>
Question 7 :
Copper crystallises infcc lattice with a unit cell edge of 361 pm. The radius of copper atom is:<br>
Question 8 :
If three elements X, Y & Z crystallized in cubic solid lattice with X atoms at corners, Y atoms at cube centre& Z -atoms at the edges, then the formula of the compound is:<br>
Question 9 :
In zinc blende structure the coordination number of ZN<sub>2</sub>+ ion is<br>
Question 10 :
Which of the following does not represent a type of crystal system?<br>
Question 11 :
If the distance between Na<sup>+</sup> and Cl<sup>-1</sup> ions in NaCl crystal is 265 pm, then edge length of the unit cell will be ?<br>
Question 12 :
The edge length of a face centered cubic cell of an ionic substance is 508 pm. If the radius of the cation is 110 pm, the radius of the anion is
Question 13 :
A crystal of NaCl, which has sodium ions and chloride ions missing from the lattice point, is said to exhibit<br>
Question 14 :
In a solid lattice the cation has left a lattice site and is located at an interstitial position, the lattice defect is<br>
Question 15 :
In a face centered cubic lattice, atom A occupies the corner positions and atom B occupies the face centered positions. If one atom of B is missing from one of the face centered points, the formula of the compound is :
Question 17 :
A substance has density of 2 kg dm-3& it crystallizes to fcc lattice with edge length equal to 700 pm,then the moalr mass of the substance is<br>
Question 18 :
Copper crystallises in a structure of face centerd cubic unit cell. The atomic radius of copper is 1.28 Å. What is axial length on an edge of copper.<br>
Question 19 :
The maximum percentage of available volume that can be filled in a face centred cubic system by atoms is-<br>
Question 21 :
Which of the following statements is correct in the body centered type cubic structure of an ionic compound?
Question 22 :
An element 'A' has face-centred cubic structure with edge length equal to 361 pm. The apparent radius of atom 'A' is -<br>
Question 24 :
The smallest repeating pattern which when repeated in three dimensions results in the crystal of the substance is called<br>
Question 25 :
Which of the following solids are not correctly matched with the bonds found between the constituent particles:<br>
Question 26 :
A group IV A element with a density of 11.35 g/cm<sup>3 </sup>crystallise in a face centered cubic lattice whose unit cell edge length is 4.95Å. Calculate its atomic mass -<br>
Question 27 :
In which of the following crystals alternate tetrahedral voids are occupied ?<br>
Question 28 :
CsBr has bcc structure with edge length 4.3. The shortest interionic distance in between Cs<sup>+</sup> and Br¯ is - <br>
Question 30 :
The crystal system for which a ≠ b ≠ c and α = β = γ = 900 is said to be :<br>