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Chemistry

HomeChemistryPage 10

In CsCl structure the coordination number of

Cs +   is a. Equal to that of Cl –  , that is 6 b. Equal to that of Cl –  , that...

In a solid ‘AB’ having the NaCl structure ‘A’ atoms occupy the corners of the cubic unit cell. If all the face centered atoms along one of the axes are removed, then the resultant stoichiometry of the solid is

a. AB2 b. A 2 B c. A4  B 3 d.  A 3 B 4 Ans. d (32)

Which of the following statements is not true about NaCl structure

a. Cl–   ions  are in fccarrangement b. Na+  ions has coordination  number 4 c. Cl–  ions has coordination numnber 6...

What is the coordination number in a square close packed structure in two dimensions

a. 2 b. 3 c. 4 d. 6 Ans. c (18)

In which of the following structures coordination number for cations and anions in the packed structure will be same

a. Cl –  ions form fcc lattice and Na+   ions occupy all octahedral voids of the unit cell b. Ca 2+ ions...

The ionic radii of

Rb+ and I–  are 1.46 Å  and 2.16 Ã… . The most probable type of structure exhibited by it is...

In Zincblende structure, zinc atom fill up

a. All octahedral holes b. All tetrahedral holes c. Half number of octahedral holes d. Half number of tetrahedral holes...

The ionic radii of

A+and B–  ions are 0.98 x 10-10  m and  1.81 x 10  m-10 . The coordination number of each ion...

Postassium has a bcc structure with nearest neighbour distance 4.52 Ã… . Its atomic weight is 39. Its denstiy will be

a.  454 b. 804 c. 852 d. 908 Ans. d (9)

The cubic unit cell of a metal (molar mass =

63. 55g mol -1 ) has an edge length of 362 pm. Its denstiy is 8.92g cm -3  . The type of unit...

A metal has a fcc lattice. The edge length of the unit cell is 404 pm. The density of the metal is

2.72 g cm -3   . The molar mass of the metal is a. 20 g mol -1 b. 40g mol -1 c. 30...

An element crtstallising in body centred cubic lattice has an edge lengths of 500 pm. If its density is 4 g cm ^-3, the atomic mass of the element is

a. 100 b. 250 c. 125 d. 150 e. 50 Ans. d (11)

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

a. 10.376 g/cm3 b. 5.188 g/ cm3 c. 7.289 g/cm3 d. 2.144 g/cm3 Ans. b (10)

Lithium has a bcc structure .Its density is 530 kg m ^-3 and its atomic mass is 6.94 g mol ^ -1 Calculate the edge length of a unit cell of Lithium metal.

a. 154 pm b. 352 pm c. 527 pm d. 264 pm Ans. b (20)

Ferrous oxide has a cubic structure and each edge of the unit cell is

50 Ã…  . Assuming density of the oxide as 4.0g – cm -3     then the number of  Fe2+   and  O2- ...

The second order Bragg’s diffraction of X – rays with

λ = 1 Å from a set of parallel planes in a metal occurs at an angle of 60º  ....

Percentage of the free space in cubic close packed structure and in body centered packed structure are respectively

a. 48 % and 26 % b. 30 % and 26 % c. 26 % and 32 % d.32% and...

The edge length of unit cell of a metal having molecular weight 75g/mol is

5 Ã… which crystallize in cubic lattice. If the density is 2g/ cc then find the radius of metal atoms....

How many unit cells are present in a cubic shaped ideal crystal of NaCl of mass 1.00g [ Atomic masses : Na = 23, Cl = 35.5]

a.  2.57 x 10 21   unit cells b.  5. 14  x 1021  unit cells c. 1.28 x 10 21    unit cells d....

In orthorhombic, the value of a, b and c are respectively

4.2 Å 8.6 Å and 8.3 Å given the molecular mass of the solute is 155 g mol -1 and that...

The pyknometric density of sodium chloride crystal is

2.165 x  103  kg m -3  while  its  X – rays density is  2.178 x 103 kg m -3 . The fraction...

When an electron in an excited Mo atom fall from L to K shell; an X- ray is emitted. These X-rays are diffracted at angles of 7.75° by planes with a separation of

2.64Ã…. What is the difference in energy between K- shell an L – shell in Mo assuming a first-order diffraction...

To obtain a diffraction peak, for a crystalline solid with inter plane distance equal to the wavelength of incident X-ray radiation, the angle of incidence should be

a. 90° b. 0° c. 30° d. 60 ° Ans. c   (6)

If the angle of incidence of X-ray of wavelength 3 Å which produces a second order diffracted beam from the (100) plane in a simple cubic lattice with interlayer spacing a = 6 Å is 30°, the angle of incidence that produce a first order diffracted beam from the (200) planes is

a. 15° b. 45° c. 30° d. 60° Ans. c (19)

10 mL of 1 m M surfactant solution forms a monolayer convering 0.24 cm^2 on a polar substance. If the polar head is approximated as a cube, which is its edge length

a. 1.0 pm b. 2. 0 nm c. 0.1 nm d. 2.0 pm Ans. d (25)

An element has a face-centred cubic (fcc) structure with a cell edge of a. The distance between the centres of two nearest tetraheadral voids in the lattice is

a. √2a b. a c. 3/2 (a) d. a/2 Ans. d Explanation : Nearest distance between tetrahedral voids in a...

The correct statement for the molecule,

Csl 3 , is a. It is covalent molecule b. it contains Cs3+   and I –3 c. It contains  Cs+  and I –3  ions...

Which of the following statements is correct for CsBr3

a. It is covalent compound b. it contains Cs3+   and Br – ions c. It contains  Cs+  and Br3–  ions d....

KCl crystallises in the same type of lattice as does NaCl. Given that

r Na +     /  r Cl –  = 0.55  and r  k+      / r Cl–   = 0. 74. Calculate the...

If the unit cell of a mineral has cubic close packed array of oxygen atoms with m fraction of octahedral holes occupied by aluminium ions and n fraction of tetrahedral holes occupied by magnesium ions, m and n respectively are

a. 1/2 , 1/ 8 b. 1 , 1/4 c. 1/2 , 1/ 2 d. 1/4 , 1/ 8 Ans....

A metal crystallizers into a lattice containing a sequence of layers of atoms of ABABAB… What percentage by volume of this lattice has empty space

a. 74 b. 26 c. 20 d. 16 Ans.  b Explanation : ABAB… is hexagonal close packing in which space...

Structure of a mixed oxide is cubic close- packed . The cubic unit cell of mixed oxide is composed of oxide ions. One fourth of the tetrahedral voids are occupied by a monovalent metal B. The formula of the oxide is

a.  ABO  2 b. A  2BO2 c. A2  B3  O4 d. AB 2 O 2 Ans. d (17)

If Agl crystallises in zinc blende structure with

I– ions at lattice points. What fraction of tetrahedral voids is occupied by  Ag + ions a.  25 % b. 50...

In a compound atoms of Y form ccp lattice and those of element X occupy 2/3rd of tetrahedral voids. The formula of the compound will be

a.  X2   Y3 b.  X2  Y c. X 3   Y 4 d. X 4  Y 3 Ans. d (12)

The

Ca2+  and F – are located in CaF 2 crystal respectively  at face centred cubic lattic points and in a. Tetrahedral...

Hexagonal close packing is found in crystal lattice of

a. Na b. Mg c. Al d. None of these Ans. b Explanation : Coordination number in hcp = 12...

A solid is made of two elements X and Z. The atoms Z are in CCP arrangement while the atom X occupies all the tetrahedral sites. What is the formula of the compound

a. XZ b. XZ2 c. X 2  Z d.  X 2  Z 3 Ans. c Explanation : Tetrahedral sites are double comparable...

In which of the following crystals alternate tetrahedral voids are occupied

a. NaCl b. ZnS c. CaF2 d. Na 2  O Ans. b (14)

The number of octahedral sites per sphere in a fcc structure is

a. 8 b. 4 c. 2 d. 1 Ans. d Explanation : Number of octahedral sites = Number of sphere...

The intermetallic compound LiAg crystallizes in cubic lattice in which both lithium and silver have coordination number of eight. The crystal class is

a. Simple cube b. Body centred cube c. Face- centred cube d. None of these Ans. b (13)
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