Brand new Course Package released! Get 99% off your first purchase with code “99”. Find out more!
Back
0

Shopping cart

Close

No products in the cart.

2022

Home2022Page 39

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 Å  . 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 Å 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

2.64Å. 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 (18)

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...

8. If a rubber ball is taken at the depth of 200 m in a pool, its volume decreases by 0.1%.

If the density of the water is 1× 103 Kg/m3   and g=10 m/s 2, then the volume elasticity in...

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)

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)

Popular posts

Haryana Police Recruitment Group C & D Vacancies & Coaching | Haryana CET Based Preparation
NEET 2026 FAQ – Syllabus, Exam Date, Preparation Tips & Course (Flame Institute)
SSC GD 2026, Notification, Apply Online, Vacancy, Eligibility, Exam Date, Syllabus, Online Form, Age Limit, PET/PST, Selection Process

Sign up to receive latest updates

Get in touch

Call us directly?

9888949978

Address

Flame Institute SCF 18 Near Chawla Lights Phase 7 Mohali

Email

FlameInstitute@gmail.com
Need some help?
Popular subjects
Need some help?

Youtube

2,3M Subribe

Facebook

2,3M Subribe

Instagram

2,3M Subribe

Twitter

2,3M Subribe
  • © 2025 Flame Institute.All rights reserved.
English
USD
error: Content is protected !!
Courses
Search

Search

    ArticlesCart