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Chemistry

HomeChemistryPage 11

In an antifluorite structure, cations occupy

a.  Octahedral voids b. Centre of cube c. Tetrahedral voids d. Corners of cube Ans. c Explanation : In antifluorite...

Which is not the correct statement for ionic solids in which positive and negative ions are held by strong electrostatic attractive forces

a. The radius r + /  r –  increase as coordination number increases b. As the difference in size of ions increases,...

Suppose the mass of a single Ag atomm is ‘m’ . Ag metal crystallizes in fcc lattice with unit cell of length ‘a’ . The density of Ag metal in terms of ‘a’ and ‘m’ is

a. 4m/a 3 b. 2m/ a 3 c. m/a 3 d. m/ 4a 3 Ans. a (9)

The correct order of the packing efficiency in different types of unit cells is..

a. fcc < bcc < simple cubic b.  fcc > bcc >simple cubic c.  fcc < bcc > simple cubic...

Which of the following statement in not true about the hexagonal close packing

a. The coordination number is 12 b. It has 74% packing efficiency c. Tetrahedral voids of the second layer are...

In which pair most efficient packing is present

a. hcp and bcc b. hcp and ccp c. bcc and ccp d. bcc and simple cubic cell Ans. b...

The ration of number of atoms present in a simple cubic body centered cubic and face centered cubic structure are respectively

a.  4 : 2 : 1 b. 8 : 1 : 6 c. 4 : 2 : 3 d. 1...

Which primitive unit cell has unequal edge lenghts

(a ≠  b ≠ c) and all axial angles different from 90 º a. Monoclinic b. Triclinic c. Hexagonal d....

The packing efficiency of the face centered cubic (fcc), body centered cubic (bcc) and simple/ primitive cubic (pc) lattices follows the order

a.  fcc > bcc > pc b. bcc > fcc > pc c. pc > bcc > fcc d.  bcc...

The metal that crystallises in simple cubic system is

a. Po b. Na c. Cu d. Ag Ans. d Explanation : Other than Ag. Pb and Hg also exist...

If at cubic cell atom A present all corners and atom B at the centre of each face. What will be the molecular formula of the compounds, if all the atoms present on one body diagonal are replaced by atom C

a. ABC 3 b.  A 3 B12 C4 c. A 3 B12 C d. AB 12  C 3     Ans. c (39)

Which metal crystallizes in a simple cubic structure

a. Polonium b. Copper c. Nickel d. Iron Ans. a (10)

The number of carbon atoms per unit cell of diamond unit cell is

a. 1 b. 4 c. 8 d. 6 Ans. c Explanation : In the diamond cubic unit cell there are...

The number of tetrahedral voids in the unit cell of diamond unit cell is

a.  4 b. 6 c. 8 d. 10 Ans. c (5)

Which of the following represents correct order of conductivity in solids

Ans. a (18)

How many molecules are there in the unit cell of sodium chloride

a. 2 b. 4 c. 6 d. 8 Ans. b (10)

Space lattice of

CaF 2  is a.  Face centred cubic b. Body centred cubic c. Simple cubic d. Hexagonal closed packing Ans. a Explanation...

The edge lengths of the unit cells in the terms of the radius of spheres constituting fcc bcc and simple cubic unit cells are respectively…

a. 2√2r, 4r/√3, 2r b.  4r√3,  2√2r, 2r c.  2r, 2√2r, 4r/√3 d.  2r, 4r√3, 2/√2r Ans. a (9)

Which of the following molecules has three- fold axis of symmetry

a. NH 3 b. C 2 H 4 c.  C O 2 d. SO 2 Ans. a Explanation : In NH  molecule the original appearance...

Potassium crystallizes with a

a. Face centred cubic lattice b. Body – centred c. Simple cubic lattice d. Orthorhombic lattice Ans. b Explanation :...

The Arrangement of

X –  ions around A +   ion in solid AX is given in the figure (not drawn to scale). If...

Nickel crystallizes in an fcc unit cell with a cell-edge length of 0.3524nm. Calculate the radius of the nickel atom

a. 1624 nm b. 0.1246nm c. 0.2164nm d. 0.1426nm Ans. b (17)

Which of the following is correct

Ans. c (7)

Graphite is a good conductor of electricity due to the presence of ….

  a. Lone pair of electrons b. Free valence electrons c. Cations d. Anions Ans. b Explanation : Graphite is...

Which of the following arrangement shows schematic alignment of magnetic moments of antiferromagnetic substance

  Ans. d (6)

If ‘a’ stands for length of the cubic system : simple cubic body centred cubic and face centred cubic then the ration of radii of the spheres in these systems will be respectively

a. 1/2 (a) : √3/2(a) : √2/2 (a) b. 1 (a) : √3 (a) : √2(a) c. 1/2 (a) : √3/4(a)...

An fcc unit of aluminium contains the equivalent of how many atoms

a. 1 b. 2 c. 3 d. 4 Ans. d (10)

Molecules /ions and their magnetic properties are given below

 Molecule/ion                             Magnetic property (i) C6 H 6  ...

Which of the following is a network solid

a.  SO 2 (solid) b. I 2 c. Diamond d. H 2 O (ice) Ans. c (4)

The amorphous form of silica is

a. Quartz b. Tridymite c. Cristobalite d. Kieselguhr Ans. d Explanation : The amorphous form of silica is kieselguhr. (13)

The number of close neighbour in a body-centred cubic lattice of identical sphere is

a. 8 b. 6 c. 4 d. 2 Ans. a (8)

if a is the length of the side of a cube, the distance between the body centered atom and one corner atom in the cube will be

a. √3/4 (a) b. √3/2 (a) c.  2 √3 (a) d.  2/√3 (a) Ans. b (6)

The crystal system of a compound with unit cell dimensions a = 0.387 , b = 0.387 and c = 0.504nm and

α = β = 90 º  and γ = 120 º is a. Cubic b. Hexagonal c. Orthorhombic d. Rhombohedral...

The number of nearest neighbour particles around each particle in a face centred cubic lattice/ unit cell is

a. 4 b. 6 c. 8 d. 12 Ans. d (12)

For tetrahedral coordination number, the radius ration

rc+ / r a-  is  a. 0. 732 – 1.000 b. 0.414 – 0.732 c. 0.225 – 0.414 d. 0.155 – 0....

The maximum radius of sphere that can be fitted in the octahedral hole of cubical closed packing of radius r is

a. 0.732 r b. 0. 414 r c. 0. 225 r d. 0. 155 r Ans. b Explanation : For...

The correct statement in the following is

a. The ionic crystal of AgBr has Schottky defect b. The unit cell having crystal parameters a = b ≠...

The Lattice site in a pure crystal cannot be occupied by

a. Molecule b. Ion c. Electron d. Atom Ans. c Explanation : Each point in a lattice is known as...

Which has no rotation of symmetry

a. Hexagonal b. Orthorhombic c. Cubic d. Triclinic Ans. d Explanation :  In a traiclinic crystal has no rotation of...

Potassium fluoride has NaCl type structure what is the distance between

K+   and  F – ions if cell edge is a cm a. 2a cm b.  a/2 cm c. 4a cm d....
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