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Chemistry

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36. The one that is extensively used as a piezoelectric material is :

a. Tridymite b. Amorphous silica c. Quartz d. Mica Ans. c Explanation : piezoelectric material are those that produce an...

34. Which type of ‘defect’ has the presence of cations in the interstitial sites

a. Frenkel defect b. Metal deficiency defect c. Schottky defect d. Vacancy defect Ans. a Explanation : frenkel defect (13)

33. Schottky defect in a crystal arises due to

a. Creation of equal number of cation and anion vacancies b. Creation of unequal number of cation and anion vacancies...

32. Experimentally it was found that a metal oxide has formula

M0.98  O. Metal M, present as M and M+2  in its oxide. Fraction of the metal which exists as M...

31. The defect that is more likely to occur in almost all types of ionic crystals is

a. Non- stoichiometric defects b. Shottky defects c. Frenkel defects d. all the above Ans. b (32)

If NaCl si dopd with

10-4  mol % of SrCl2  the concentration of cation vacancies will be a. 6.02 x 1015 mol -1 b. 6.02 x...

With which one of the following elements silicon should be doped so as to give p type of semicondutor

a. Selenium b. Boron c. Germanium d. Arsenic Ans. b Explanation   : Boron can easily form positive ion. When silicon...

Some of the polar crystal when heated produce electric current. This phenomena is termed as

a. Ferroelectric effect b. Pyrelectric effect c. Antiferroelectric effect d. piezoelectric effect Ans. b Explanation : pyroelectircity : It is...

Which of the following is true about the charge acquired by p-type semiconductors.

a. Positive b. Neutral c. Negative d. Depends on concentration of p impurity Ans. b (5)

If an electron is present in place of anion in a crystal lattice, then it is called

a. Frenkel defect b. Sohottky defect c. Intersitital defects d. F- centre Ans. d Explanation : When electorns are trapped...

Which defect in any crystal lowers its density

a. F centre b. Frenkel c. Sohottky d. Interstital Ans. c Explanation : During the schottkky defects same number of...

When electorns are trapped into the crystal in anion vacancy the defect is known as

a. Schotky defect b. Frenkel defect c. Stoichiometric defect d. F- centres Ans. d Explanation : F- centres are the...

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

a.  Frenkel defect b. Interstitial positions c. F- centres d. Schottky defects Ans. c   (10)

In a solid lattice the cation has left a lattice site and is located at an interstitial position, the lattice defect is

a. Interstitial defect b. Valency defect c. Frenkel defect d. Schottky defect Ans. c   (9)

Frenkel and Schottky defects are

a. Nucleus defects b. Non-crystal defects c. Crystal defects d. None of these Ans. c Explanation : Both are stoichiometric...

Due to Frenkel defect, the density of ionic solids

a. Increases b. decreases c. Does not change d. Changes Ans. c Explanation : Since no ions are missing from...

The correct statement regarding defects in crystalline solid is

a. Schottky defects have no effect on the density of crystalline solids b. Frenkel defects decrease the density of crystalline...

The correct statement regarding F- centre is

a. Electron are held in the  voids of crystals b. F- centre produces colour to the crystal c. Conductivity of...

Element ‘B’ forms ccp structure and ‘A’ occupies half of the octahedral voids, while oxygen atoms occupy all the tetrahedral voids. The structure of bimetallic oxide is

a. A 2 BO4 b. A 2 B 2  O c. A B2  O4 d. A 4 B2  O Ans. c (36)

A compound of formula

A2 B 2 has the hcp lattice. Which atom forms the hcp lattice and what fraction of tetrahedral voids is occupied...

In

Na2 O having antiflourite structure a. Oxide ions have a cubic close packed arrangement and Na+  occupy all the eight...

A mineral consists of a cubic close packed structure formed by

O2-  ions where half the octahedral voids are occupied by Al 3+ and one eight of the tetrahedeal voids are occupied...

A unit cell of calcium fluoride has four calcium ions. The number of fluoride ions in the unit cell is

a. 2 b. 4 c. 6 d. 8 Ans. d (16)

The crystal structure of solid Mn(II) oxide is

a. NaCl structure b. Fe2 O3  structure c. CaF2 structure d. Na2 O structure Ans. a (37)

In calcium flouride having the fluorite structure, the coordination numbers for calcium ion and fluoride ion are

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

What is the coordination number of sodium in

Na2 O a. 6 b. 4 c. 8 d. 2 Ans. b (24)

Which set of characteristics of ZnS crystal is correct

a. Coordination number ( 4 : 4); ccp;  Zn++   ion in the alternate tetrahedral voids b. Coordination number ( 6...

If the distance between

Na + and Cl – ions is sodium chloride crystal is X pm, the length of the edge of the unit cell...

A solid compound contains X,Y and Z atoms in a cubic lattice with X atoms occupying the corners. Y atoms in the body centered positions and Z atoms at the centres of face of the unit cell. What is the empirical formula of the compound

a. XY2  Z3 b. XYZ3 c. X2 Y2 Z3 d.  X8 YZ6 Ans. b (14)

If the pressure on a NaCl structure is increased then its coordination number will

a. Increase b. Decrease c. Remain the same d. Either (b) or (c) Ans. a (13)

A solid compound XY has NaCl structure. If the radius of the cation is 100 pm, the radius of the anion (y-) will be

a. 241. 5 pm b. 165. 7 pm c. 275.1 pm d. 322. 5 pm Ans. a (11)

The radii of

Na+ and Cl– ions are 95 pm and 181 pm respectively. The edge legth of NaCl unit cell is a....

In the closest packed structure of a metallic lattice, the number of nearest neightbours of a metallic atoms is

a. Twelve b. Four c. Eight d. Six Ans. a Explanation : Coordination number in hcp and ccp arrangement is...

Radius ration of an ionic compound is 0.93. The structure of the above ionic compound is of

a.  NaCl type b. CsCl type c. ZnS type d. None of these Ans. b Explanation : Radius ration range...

The unit cell of a binary alloy composed of A and B metals, has a ccp structure with a atoms occupying the corners and B atoms occupying centres if each face of the cube. If during the crystalization of this alloy, in the unit cell two A atom are missed the overall composition per unit cell is

a. AB6 b. AB4 c. AB8 d. AB24 Ans. b (66)

The interionic distance for cesium chloride crystal will be

a. a b. a/2 c. √3a/2 d. 2a/√3 Ans. c Explanation : As CsCl is body-centred d = √3a/2 (14)

An example of fluorite structure is

a. NaF b. SrF 2 c. AlCl 3 d.SiF4 Ans.b Explanation : SrF 2  has fluorite type structure. (10)

A metal crystallizes in a face centred structure. If the edge length of its unit cell is ‘a’ the closest approach between two atoms in metallic crystal will be

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

A solid having density of

9 x 103  kg m-3  forms face centred cubic crystals of edge length  200 √2  pm. What is the molar...

Body centered cubic lattice has a coordination number of

a. 4 b. 8 c. 12 d. 6 Ans. b Explanation : Body centered cubic lattice has a coordination number...

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