Practice Test


1) The phenomenon of X - rays was studied by


2) The number of basic types of unit cells among the crystals is


3) The number of atoms per unit cell in a body centred cubic arrangement is


4) ABABABA...type of arrangement of different layers in close packed structure is called


5) The number of atoms per unit cell in a simple cubic arrangement is


6) Which of the following is not a crystal system?


7) The smallest repeating pattern which when repeated again and again results in the crystal of substance is called


8) The most unsymmetrical crystal system is :


9) Which of the following type of cubic lattice has maximum number of atoms per unit cell?


10) The coordination number in a ccp arrangement of atoms is


11) The interparticle forces in solid hydrogen are :


12) An example of an ionic crystalline solid is


13) A pure crystalline substance on heating forms a turbid looking liquid at a constant temperature and then at a still higher constant temperature the turbidity completely disappears. This behaviour is characteristic of


14) Which one has highest melting point?


15) The number of octahedral sites for a lattice consisting of N - atoms is


16) In rock salt structure, what percentage of the octahedral sites are occupied by cations?


17) Which of the following is not the property of crystalline solids?


18) Some polar crystals produce small electric current on heating. This phenomenon is called


19) An example of ferroelctric is


20) If the radius of an octahedral void is r and the radius of atom in close packing is R, then the relation between r and R is


21) If the alignment of magnetic moments in a substance is in a compensatory way so as to give zero net magnetic moment, then the substance is said to be


22) When atoms are placed at the corners of all 12 edges of a cube, the number of atoms present per unit cell is :


23) Pyroxenes belong to


24) Which of the following is an example of three dimensional silicates?


25) Which of the following is not correct consequences of Schottky defects?


26) Rock salt type structure is not adopted by


27) The number of NaCl formula units in a unit cell of sodium chloride is


28) The most unsymmetrical unit cell is


29) Madelungs constant depends upon


30) Asbestos is an example of


31) Body centred cubic lattice has coordination number


32) Metallic gold crystallizes in body centred cubic lattice. The coordination number of gold is


33) Crystals can be described into ______ basic crystal habits


34) Which of the following is having hexagonal close packed crystal structure?


35) An example of a body centred cube is


36) The inter-matallic compound LiAg crystallizes in cubic lattice in which both lithium and silver have coordination number - eight. The class lattice is


37) A metallic element crystallizes into a lattice containing a sequence of layers of ABABAB ............ Any packing of spheres leaves out voids in the lattice. What percentage by volume of this lattice is empty space?


38) The edge length of a cube is 520 pm. Its body diagonal would be


39) Close packing is maximum in the crystal which is


40) In the normal spinel structure, some of the tetrahedral holes in the close-packed structure are occupied by


41) In a primitive cubic lattice, the percentage of void volume is


42) CsCl has bcc arrangement and its unit cell length is 400 pm. The interionic distance in CsCl is


43) Body diagonal of a cube is 866 pm. Its edge length would be


44) In a cubic crystal anions are arranged in fcc arrangement and the cations occupy all the octahedral voids and half the tetrahederal voids. The ratio of the cations and anions in the crystal is


45) In a CsCl structure, the ratio of cations and anions is


46) Which of the following does not belong to same type of crystal?


47) Schottky defect in crystals is observed when


48) When molten zinc is cooled to solid state, it assumes hcp structure. Then the number of nearest neighbours of zinc atoms will be


49) In a hexagonal close packed (HCP) structure of spheres, the fraction of the volume occupied by the spheres is A. In a cubic close packed structure, the fraction is B. The relation for A and B is


50) Which of the following is an example of covalent solid?


51) Which of the is a molecular solid?


52) In which of the following pairs, the cations occupy, same type of site


53) In which of the following structures, the cation has maximum coordination number?


54) The normal spinel structure is adopted by


55) The example of ortho silicates is


56) The arrangement of NaCl crystal may be described as


57) Which of the following transition metal oxides is diamagnetic?


58) In which of the following structures, there is maximum coordination number for the cation?


59) An example of a ferromagnetic oxide is


60) The basic unit in pyrosilicates is


61) A solid is made up of two elements A and B. Atoms of B are in ccp arrangement, while atoms A occupy all the tetrahedral sites. The formula of the compound is


62) Which of the following transition metal oxides is not an insulator?


63) A compound formed by two elements X and Y crystallizes in the cubic structure where Y atoms are at the corners of a cube and X atoms are at alternate faces. The formula of the compound is


64) In corundum, oxide ions are arranged in hcp arrangement and the aluminium ions occupy two-third of the octahedral holes. Its formula is:


65) A compound formed by elements A and B has a cubic structure in which A atoms are at the corners of the cube and B atoms are at the face centers. The formula of the compound is


66) One unit cell of NaCl contains


67) Which of the following is ferrite?


68) An example of antiferroelectric substance is


69) A compound is formed by elements A and B. This crystallizes in the cubic structure where the A atoms are at the corners of the cube and B atoms are at the body centers. The simplest formula of the compound is


70) An element (atomic mass = 100 g /mol) having bcc structure has unit cell edge 400 pm. The density of the element is:


71) The anions (Y) form hexagonal close packing and atoms (X) occupy only 2/3 of the octahedral voids in it, then the general formula of the compound is


72) Which of the following dimensions represent triclinic unit cell?


73) An alloy of CU, Au and Ag is found to have Cu constituting the CCP lattice. If Ag atoms occupy edge centers and Au is present at body centers, the alloy has formula:


74) Fraction of total volume occupied by atoms in a simple cubic cell is


75) In a face centred arrangement of X and Y atoms, X atoms are at the corners of the unit cell, Y atoms are at the face centres, two atoms are missing from two corners of each unit cell, then the simplest formula of the compound is


76) In a structure, A atoms have fcc arrangement, B atoms occupy all the tetrahedral sites and C atoms occupy half the octahedral sites. The formula of the compound is


77) A compound formed by elements A and B crystallises in the cubic structure where A atoms are at the corners of the cube and B atoms are at the face centres. The formula of the compound is


78) A compound formed by elements X and Y crystallises in a cubic structure in which atoms X are at the corners of the cube and atoms Y are at the face centres. The formula of the compound is


79) In which of the following crystals alternate tetrahedral voids are occupied?


80) Total volume of atoms present in face centred cubic unit cell of metal is (r is atomic radius)


81) A compound formed by elements A and B crystallises in the cubic structure where A atoms are at the corners of the cube and B atoms are at the face centres. The formula of the compound is


82) Metallic gold crystallises in the f.c.c. cubic lattice The length of the cubic unit cell is a = 4.070 A, what is the closed distance between gold atoms?


83) Schottky defect defines imperfections in the lattice structure of a


84) An element (atomic mass = 100 g/mol) having BCC structure has unit cell edge 400pm. The density of element is (No. of atoms in BCC, Z = 2)


85) The major binding force of diamond, silicon and quartz is


86) The number of tetrahedral voids in the unit cell of a face centred cubic lattice of similar atoms is


87) In a face centred cubic lattice, a unit cell is shared equally by how many unit cells?


88) A crystalline solid has a cubic structure in which tungsten (W) atoms are located at the cubic corners of the unit cell, oxygen atoms at the cube dges and sodium atom at the cube centre. The molecular formula of the compound is


89) 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 th unit cell is equal to:


90) The appearance of colour in solid alkali halides is generally due to


91) Percentage of free space in a body centred cubic unit cell is


92) If 'a' stands for the edge length of the cubic systems: simple cubic, body centred cubic and face centred cubic, then the ratio of radii of the spheres in these systems will be respectively.


93) Which of the following statements is not correct?


94) Copper crystallises in a face- centred cubic lattice with a unit cell length of 361 pm. What is the radius of copper atoms in pm?


95) Lithium metal crystallises in a body centred cubic crystal. If the length of the side of the unit cell of lithium is 351 pm, the atomic radius of the lithium will be.


96) Total number of voids in 0.5 mole of a compound forming hexagonal closed packed structure are


97) Which of the following compounds shows both Frenkel and Schottky defects?


98) the crystal with metal deficiency defect is


99) AB crystallizes in a body centred cubic lattice with edge length 'a' equal to 387 pm. The distance between two oppositely charged ions in the lattice is


100) In a molecular crystal, the forces holding together the atoms within a given molecule are


101) The fraction of the volume occupied in primitive cubic unit cell is


102) In the body centred cubic unit cell cubic of closest packed atoms the radius of atom (r) is related to the edge length (a) of unit cell as


103) The number of atoms associated with face centred cubic, body centred cubic and simple cubic are respectively


104) The anions (B) from hcp structure and cations (A) occupy only 2/3 octahedral holes in it, then the general formula of the compound is


105) In which of the following the cation has higher coordination number than anion?


106) The coordination number in ccp and hcp arrangement of metal atoms are respectively.


107) A metal crystallizes in two cubic phases, fcc and bcc hose unit cell lengths are 3.5A and 3.0 A respectively. The ratio of density of fcc and bcc is


108) If the ratio of coordination number P to that of Q be Y : Z, then the formula of the solid is


109) The edge length of face centred cubic unit cell is 508 pm. If the radius of the cation is 110 pm, the radius of the anion is


110) The coordination number of a metal crystallising in a hexagonal close packing structure is


111) A metallic crystal crystallizes into a lattice containing a sequence of layers ABABAB .......Any packing of spheres leaves out voids in the lattice. What percentage by volume of this lattice is empty space?


112) Xenon crystallizes in a face centred cubic lattice and the edge of the unit cell is 600pm, then the radius of xenon atom is


113) The 8 : 8 type of packing is present in


114) In a hexagonal primitive unit cell, the corner is shared by


115) In a solid lattice, the cation and the anion have left a lattice site. The lattice defect is known as


116) If three elements A, B and C crystallized in cubic solid lattice with A atoms at corners, B atoms at cube centres and C atoms at the edges, then the formula of the compound is


117) The edge length of fcc unit cell is 512 pm. If the radius of the cation is 121 pm, the radius of anion is


118) In a solid AB having NaCl structure, A atoms occupy the corners of th cubic unit cell. If all the face centred, then the resultant stoichiometry of the solid is


119) A solid is made up of two elements P and Q. Q atom are in ccp arrangement while atoms P occupy half the tetrahedral sites. The formula of the compound.