Question 1 :
In a face centred cubic cell, what is the contribution of an atom at the face-center?
Question 2 :
In $sc, bcc$ and $fcc$ the ratio of number of atoms per unit cell is given by:
Question 3 :
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 4 :
Which of the following statements is correct in the body centered type cubic structure of an ionic compound?
Question 5 :
If Z is the number of atoms in the unit cell that represents the closest packing sequence ABC ABC ... , the number of tetrahedral voids in the unit cell is equal to -<br>
Question 7 :
A metal crystallises into a lattice containing a sequence of layers as AB AB AB _______. What percentage of voids are left in the lattice?
Question 8 :
A crystal of NaCl, which has sodium ions and chloride ions missing from the lattice point, is said to exhibit<br>
Question 9 :
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 11 :
The radius of the Na<sup>+</sup> is 95 pm and that of Cl<sup>-</sup> ion is 181 pm. Predict the co-ordination number of Na<sup>+</sup><sup><br>
Question 12 :
In a compound, atoms of element Y form ccp lattice and those of element X occupy 2/3<sup>rd</sup> of tetrahedral voids. The formula of the compound will be
Question 14 :
In an arrangement of type ABABA... identical atoms of I layer A and III layer A are joined by a line passing through their centers. Suggest the correct statement.<br>
Question 15 :
The radius of Ag+ ion is 126 pm and that of Ι- ion is 216 pm. The co-ordination number of Ag+ ion is.<br>
Question 16 :
The number of nearest neighbours to each sphere in hexagonal close packing pattern in its own layer will be:<br>
Question 17 :
In which of the following crystals alternate tetrahedral voids are occupied ?<br>
Question 18 :
Given an alloy of Cu, Ag and Au in which Cu atoms constitute the CCP arrangement.If the hypothetical formula of the alloy is Cu4Ag3Au. What are the probable locations of Ag and Au atoms.<br>
Question 19 :
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 21 :
A solid compound contains X, Y and Z atoms in a cubic lattice with X atoms occupying the corners, Y atoms in the body centred positions and Z atoms at the centre of the faces of the unit cell. What is the empirical formula of the compound ?<br>
Question 22 :
The correct order of the packing efficiency in <br>different types of unit cells is ......... .<br>
Question 23 :
In a solid lattice the cation has left a lattice site and is located at an interstitial position, the lattice defect is<br>
Question 24 :
Na and Mg crystallize in BCC and FCC type crystals respectively, then the number of atom of Na and Mg present in the unit cell of their respective crystal is
Question 25 :
Which of the following solids are not correctly matched with the bonds found between the constituent particles:<br>
Question 26 :
An element (atomic mass = 100 g/mole) having bcc structure has unit cell edge 400 pm. The density of the element is (no. of atoms in bcc(Z) = 2).<br>
Question 28 :
Zinc Oxide, white in colour at room temperature, acquires yellow colour on heating due to:<br>
Question 29 :
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 30 :
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 31 :
In a compound, atoms of element Y form ccp lattice and those of element X occupy 2/3rd tetrahedral voids. The formula of the compound will be -<br>
Question 32 :
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 34 :
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 35 :
CsBr has bcc structure with edge length 4.3. The shortest interionic distance in between Cs<sup>+</sup> and Br¯ is - <br>
Question 36 :
The smallest repeating pattern which when repeated in three dimensions results in the crystal of the substance is called<br>
Question 37 :
The crystal system for which a ≠ b ≠ c and α = β = γ = 900 is said to be :<br>
Question 38 : $I$. Metallic solids tend to be very brittle.<div>$II$. Metallic bonds are broken quite easily.</div>
Question 39 :
The maximum percentage of available volume that can be filled in a face centred cubic system by atoms is-<br>
Question 40 :
A compound XY crystallizes in bcc lattice with unit cell edge- length of 480 pm, if the radius of Y- is 225 pm, then the radius of X+ is<br>
Question 41 :
In a face centred cubic lattice, atom A occupies the corner positions and atom B occupies the face centre positions. If one atom of B is missing from one of the face centred points, the formula of the compound is:<br>
Question 43 :
Which of the following statements are correct in context of point defects in a crystal ?<br>
Question 44 :
In zinc blende structure the coordination number of ZN<sub>2</sub>+ ion is<br>
Question 45 :
Which of the following does not represent a type of crystal system?<br>
Question 47 :
In a normal spinel types structure, the oxide ions are arranged in ccp whereas 1/8 tetrahedral holes are occupied by ZN<sub>2</sub>+ ions and 50% of octahedral holes are occupied by Fe<sub>3</sub>+ ions. The formula of the compound is -<br>
Question 48 :
copper crystallises in fcc with a unit cell length of 361 pm. What is the radius of copper atom ?
Question 49 :
Which of the following statements is correct in the rock-salt structure of ionic compounds?<br>
Question 50 :
An element 'A' has face-centred cubic structure with edge length equal to 361 pm. The apparent radius of atom 'A' is -<br>
