Q.1.
A particular solid is very hard and has a high melting point. In solid state, it is a non-conductor and its melt is a conductor of electricity. Classify the solid ...[ CMC Vellore 2008]
-
14%
a) metallic
-
14%
b) molecular
-
71%
c) ionic
-
0%
d) network
Q.2.
In a solid, oxide ions(O2-) are arranged in ccp, cations (A3+) occupy one-sixth of tetrahedral void and cations (B3+) occupy one third of the octahedral voids. What is the formula of the compound?
-
0%
a) ABO2
-
16%
b) ABO3
-
11%
c) AB2O3
-
74%
d) A2BO3
Explanation
Q.3.
The pyknometric density of sodium chloride crystal is 2.165×103 kg m-3 while its X-ray density is 2.178×103 kgm-the fraction of unoccupied sites in sodium chloride crystal is ...[ CBSE 2003]
-
0%
a) 5.96×10-1
-
100%
b) 5.96×10-3
-
0%
c) 5.96
-
0%
d) 5.96×10-2
Explanation
Q.4.
The ability of a given substance to assume two or more crystalline structure is called ...[ Manipal 2005]
-
33%
a) polymorphism
-
0%
b) amorphism
-
33%
c) isomorphism
-
33%
d) isomerism
Q.5.
A compound is formed by elements A and B. This crystallizes in the cubic structure when atoms A are at the corner of the cube and atoms B are at the center of the body. The simple formula of the compound is ...[ DPMT 2009]
-
12%
a) A2
-
0%
b) AB4
-
25%
c) AB
-
62%
d) A2B
Q.6.
The major binding force of diamond, silicon and quartz is ...[ MEE 2002]
-
60%
a) electrostatic force
-
20%
b) covalent bond force
-
20%
c) non-covalent bond force
-
0%
d) van der Waals' force
Q.7.
An electron trapped in an anion cavity in a crystal is called ...
-
0%
a) Frenkel defect
-
25%
b) Schottky defect
-
25%
c) interstitial
-
50%
d) F-centre
Q.8.
The edge length of face-centred cubic cell of ionic substance is 508pm. If the radius of the cation is 110pm, the radius of an ion is ...
-
0%
a) 618pm
-
67%
b) 144pm
-
33%
c) 288pm
-
0%
d) 398pm
Explanation
Q.9.
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 position and Z atoms at the centre of the faces of the unit cell. What is the empirical formula of the compound
-
14%
a) XYZ
-
71%
b) XY2Z3
-
0%
c) X8YZ6
-
14%
d) XYZ3
Q.10.
Assertion: Antiferromagnetic solids have a net magnetic moment Reason: MnO is an antiferromagnetic solid
-
25%
a) If both the assertion and reason are true and reason explains the assertion.
-
50%
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
-
25%
d) If assertion is false but reason is true.
Q.11.
In a compound, atoms of element Y from ccp lattice and those of element X occupy 2/3rd tetrahedral voids. The formula of the compound will be
-
25%
a) X4Y3
-
25%
b) X2Y3
-
50%
c) X3Y4
-
0%
d) X2Y
Q.12.
The unit cell of Al(molar mass 27 g/mol) has an edge length of 405pm. Its density is 2.7g/cmThe cubic unit cell is ..
-
50%
a) face-centred
-
0%
b) body-centred
-
50%
c) primitive
-
0%
d) edge-centred
Explanation
Q.13.
A metallic element has a cubic lattice. Each edge of the unit cell 2Å. The density of the metal is 2.5g/cmThe unit cells in 200g of the metal are ... [ CBSE 1994]
-
0%
a) 1×1024
-
0%
b) 1×1020
-
0%
c) 1×1022
-
100%
d) 1×1025
Explanation
Q.14.
Assertion: Molecular solids have low melting point Reason: Molecular solids are composed of covalent molecules
-
75%
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
-
25%
c) If assertion is true but reason is false
-
0%
d) If assertion is false but reason is true.
Q.15.
crystalline solid is made of two elements 'A' and 'B'. Atoms of 'A' are present at corners and atoms of 'B' at face-centres. One atom of 'A' is missing from a corner. The simplest formula of the solid will be ..
-
0%
a) A8B21
-
0%
b) AB3
-
67%
c) A7B3
-
33%
d) A7B24
Explanation
Q.16.
A solid X+Y- has a bcc structure. If the distance of closest approach between the ions is 173 pm, the edge length of the cell is
-
0%
a) √2 pm
-
60%
b) (√3/2) pm
-
20%
c) 200 pm
-
20%
d) 400 pm