Q.1.
An electron trapped in an anion site in crystal is called
-
25%
a) F-centre
-
50%
b) Frenkel defect
-
25%
c) Schottky defect
-
0%
d) Interstitial defect
Q.2.
How many unit cells are present in a cube shaped ideal crystal of NACl of mass 1.0g? [ AIEEE 2003]
-
40%
a) 2.57 × 1021 unit cells
-
40%
b) 5.14 × 1021 unit cells
-
20%
c) 1.28 × 1021 unit cells
-
0%
d) 1.71 × 1021 unit cells
Explanation
Q.3.
Empty space in ccp lattice is
-
20%
a) 26%
-
20%
b) 45%
-
40%
c) 90%
-
20%
d) 30%
Q.4.
Gold has a close-packed structure which can be viewed as spheres occupying 0.74 of the total volume. What is the radius of gold ion if density of gold is 19.3 g/cc? ( Au = 197 amu)
-
60%
a) 1.439 ×10-8 cm
-
0%
b) 4.07 × 10-8 cm
-
40%
c) 1.017 ×10-8 cm
-
0%
d) 8.23 ×10-8 cm
Explanation
Q.5.
The ability of a given substance to assume two or more crystalline structure is called
-
0%
a) Polymorphism
-
25%
b) Isomorphism
-
25%
c) Amorphism
-
50%
d) Isomerism
Q.6.
Which of the following metal oxide is antiferromagnetic in nature [ MP CET 2002]
-
0%
a) MnO2
-
40%
b) TiO2
-
40%
c) NO2
-
20%
d) CrO2
Q.7.
In a solid lattice the cation and anion both have left a lattice site. The lattice defect is known as
-
0%
a) Interstitial defect
-
25%
b) Valency defect
-
50%
c) Frenkel defect
-
25%
d) Schottky defect
Q.8.
Ionic solids with Schottky defects contain in their structure
-
50%
a) Equal number of caation and anion vacancies
-
25%
b) Interstitial anions and anion vacancies
-
25%
c) Cation vacancies only
-
0%
d) Cation vacancies and interstitial cations
Q.9.
Total volume of atoms present in face centred cubic unit cell of metal is ( r atomic radius)
-
25%
a) (20/3) π r3
-
0%
b) (24/3) π r3
-
50%
c) (12/3) π r3
-
25%
d) (16/3) π r3
Explanation
Q.10.
In a feromagnetic material
-
25%
a) All the magnetic moment vectors are aligned in one direction
-
50%
b) Half of the magnetic moment vectors point in one direction and rest in the opposite direction
-
0%
c) All the magnetic moment vectors are randomly oriented
-
25%
d) Is characterised by small magnetic moment
Q.11.
An ionic compound has unit cell consisting of A ions at the corners of cube and B ions on the centres of the faces of the cube. The empirical formula of this compound would be [ AIEEE 2005]
-
33%
a) AB3
-
33%
b) A3B
-
33%
c) AB
-
0%
d) A2B
Q.12.
In a solid lattice, the cation has left a lattice site and is located at an interstitial position. The lattice defect is ...[ BHU 2008]
-
0%
a) Interstitial defect
-
0%
b) Vacancy defect
-
67%
c) Frenkel defect
-
33%
d) Schottky defect
Q.13.
Total volume of atoms present in a face-centred cubic unit cell of a metal is (r is atomic radius) [ JIPMER 2008]
-
40%
a)
-
20%
b)
-
20%
c)
-
20%
d)
Q.14.
Assertion: Graphite is soft while diamond is hard Reason: Graphite has three dimensional structure while diamond has planar [ BHU 2008]
-
25%
a) If both the assertion and reason are true and reason explains the assertion.
-
25%
b)If both the assertion and reason are true but reason does not explain the assertion
-
25%
c) If assertion is true but reason is false
-
25%
d) If assertion is false but reason is true.
Q.15.
Which one of the following is a covalent solid?
-
0%
a) Fe
-
0%
b) Cu
-
50%
c) Sodium chloride
-
50%
d) Diamond
Q.16.
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 ...
-
50%
a) ferromagnetic
-
0%
b) anti-ferromagnetic
-
25%
c) ferrimagnetic
-
25%
d) diamagnetic
Q.17.
In a solid, oxide ions are arranged in ccp. Cation 'A' occupy one-sixth of the tetrahedral voids and cations 'B' occupy one-third of the octahedral voids. The formula of the compound is ...
-
0%
a) A2BO3
-
0%
b) AB2O3
-
67%
c) ABO3
-
33%
d) A2O2O3
Explanation
Q.18.
If we know the ionic radius in crystal of ionic solid, which of the following can be known?
-
25%
a) Magnetic property
-
25%
b) Nature of chemical bond
-
25%
c) Type of defect
-
25%
d) Geometry of crystal
Q.19.
An alloy of Cu, Ag and Au is found to have copper constituting ccp lattice. If silver atoms occupy the edge-centres and gold is present at body-centre, the alloy has the formula
-
0%
a) CuAgAu
-
25%
b) Cu4Ag4Au
-
25%
c) Cu4Ag2
-
50%
d) Cu4Ag3Au
Q.20.
Schoottky defect is crystals is observed when ...[ CBSE 1998]
-
25%
a) an ion leaves its normal site and occupies an interstitial site
-
25%
b) unequal number of cations and anions are missing from the lattice
-
0%
c) density of the crystal is increased
-
50%
d) equal number of cations and anions are missing from the lattice
Q.21.
The cohesive force involved in ice is ..
-
50%
a) hydrogen bonding
-
0%
b) electrostatic
-
25%
c) van der Waal's force
-
25%
d) covalent network
Q.22.
What is the coordination number of sodium in Na2O? [ AIIMS 2003]
-
50%
a) 2
-
25%
b) 4
-
25%
c) 6
-
0%
d) 8
Q.23.
The number of atoms in one unit cell of a face-centered cubic lattice is ...[ BHU 1998]
-
0%
a) 2
-
25%
b) 3
-
75%
c) 4
-
0%
d) 5
Q.24.
Assertion: An ccp arrangement, a tetrahedral void is surrounded by four spheres whereas an octahedral void is surrounded by six spheres Reason: Size of tetrahedral void is smaller than that of octahedral void
-
100%
a) If both the assertion and reason are true and reason explains the assertion.
-
0%
b)If both the assertion and reason are true but reason does not explain the assertion
-
0%
c) If assertion is true but reason is false
-
0%
d) If assertion is false but reason is true.
Q.25.
In compound XY2O4, oxide ions are arrangement in ccp anad cations X are present in octahedral voids. Cation Y are equally, distributed among octahedral and tetrahedral voids. the fraction of the octahedral voids occupied is
-
0%
a) 1/2
-
100%
b) 1/4
-
0%
c) 1/6
-
0%
d) 1/8
Q.26.
In a closed packed array of N spheres, the octahedral holes are ...
-
0%
a) N/2
-
33%
b) 2N
-
0%
c) 4N
-
67%
d) N
Q.27.
A solid compound contains X, Y and Z atoms in a cubic lattice with X atoms occupying the corners, Y atoms in the body centred position and Z atoms at the centres of faces of unit cell. What is the empirical formula of the compound?
-
0%
a) Z8YZ6
-
67%
b) XYZ3
-
0%
c) XY2Z3
-
33%
d) X2Y2Z3
Q.28.
Which of the following statement is not correct? [ CBSE 2008]
-
25%
a) The number of carbon atoms in a unit cell of diamond is 4
-
50%
b) The number of Bravis lattices in which a crystal can be categorized is 14
-
25%
c) The fraction of the total volume blank by the atoms in a primitive cell is 0.48
-
0%
d) Molecular solids are generally volatile
Q.29.
Which of following is not correct about ZnS?
-
0%
a) S2- ions are present in ccp arrangement
-
0%
b) Zn2+ ions occupy half of the tetrahedral voids
-
0%
c) Octahedral voids are empty
-
100%
d) Coordination number of Zn2+ ion is 6
Q.30.
Assertion: The effusion rate of oxygen is smaller than that of nitrogen Reasons: Molecular size of nitrogen is smaller than that of oxygen ...[ AIIMS 2004]
-
33%
a) If both the assertion and reason are true and reason explains the assertion.
-
67%
b)If both the assertion and reason are true but reason does not explain the assertion
-
0%
c) If assertion is true but reason is false
-
0%
d) If assertion is false but reason is true.