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question_answer1)
The correct statement in the following is [MP PET 1997]
A)
The ionic crystal of \[AgBr\] has Schottky defect done
clear
B)
The unit cell having crystal parameters, \[a=b\ne c,\,\,\]\[\alpha =\beta ={{90}^{o}},\,\,\gamma ={{120}^{o}}\] is hexagonal done
clear
C)
In ionic compounds having Frenkel defect the ratio \[\frac{{{\gamma }_{+}}}{{{\gamma }_{-}}}\] is high done
clear
D)
The coordination number of \[N{{a}^{+}}\]ion in \[NaCl\] is 4 done
clear
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question_answer2)
Which of the following is correct [DPMT 1997]
A)
B)
C)
D)
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question_answer3)
Tetragonal crystal system has the following unit cell dimensions [MP PMT 1993]
A)
\[a=b=c\] and \[\alpha =\beta =\gamma ={{90}^{o}}\] done
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B)
\[a=b\ne c\] and \[\alpha =\beta =\gamma ={{90}^{o}}\] done
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C)
\[a\ne b\ne c\] and \[\alpha =\beta =\gamma ={{90}^{o}}\] done
clear
D)
\[a=b\ne c\] and \[\alpha =\beta ={{90}^{o}},\,\,\,\gamma ={{120}^{o}}\] done
clear
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question_answer4)
Rhombic sulphur has the following structure
A)
Open chain done
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B)
Tetrahedral done
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C)
Puckered 6-membered ring done
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D)
Puckered 8-membered ring done
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question_answer5)
Space lattice of \[Ca{{F}_{2}}\] is [MP PMT 1993]
A)
Face centred cubic done
clear
B)
Body centred cubic done
clear
C)
Simple cubic done
clear
D)
Hexagonal closed packing done
clear
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question_answer6)
For cubic coordination the value of radius ratio is
A)
\[0.732-1.000\] done
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B)
\[0.225-0.414\] done
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C)
\[0.000-0.225\] done
clear
D)
\[0.414-0.732\] done
clear
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question_answer7)
How many space lattices are obtainable from the different crystal systems [MP PMT 1996; MP PET/PMT 1998]
A)
7 done
clear
B)
14 done
clear
C)
32 done
clear
D)
230 done
clear
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question_answer8)
Example of unit cell with crystallographic dimensions \[a\ne b\ne c,\,\,\alpha =\gamma ={{90}^{o}},\,\,\beta \ne {{90}^{o}}\] is [AFMC 1998]
A)
Calcite done
clear
B)
Graphite done
clear
C)
Rhombic sulphur done
clear
D)
Monoclinic sulphur done
clear
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question_answer9)
In a face-centered cubic lattice, a unit cell is shared equally by how many unit cells [CBSE PMT 2005]
A)
8 done
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B)
4 done
clear
C)
2 done
clear
D)
6 done
clear
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question_answer10)
The maximum radius of sphere that can be fitted in the octahedral hole of cubical closed packing of sphere of radius \[r\] is
A)
0.732 \[r\] done
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B)
0.414 \[r\] done
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C)
0.225 \[r\] done
clear
D)
0.155 \[r\] done
clear
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question_answer11)
The unit cell of a \[NaCl\] lattice
A)
Is body centred cube done
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B)
Has \[3N{{a}^{+}}\]ions done
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C)
Has \[4NaCl\] units done
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D)
Is electrically charged done
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question_answer12)
For tetrahedral coordination number, the radius ratio \[\frac{{{r}_{{{c}^{+}}}}}{{{r}_{{{a}^{-}}}}}\] is [KCET 2000]
A)
\[0.732-1.000\] done
clear
B)
\[0.414-0.732\] done
clear
C)
\[0.225-0.414\] done
clear
D)
\[0.155-0.225\] done
clear
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question_answer13)
What type of lattice is found in potassium chloride crystal [MP PMT 1996]
A)
Face centred cubic done
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B)
Body centred cubic done
clear
C)
Simple cubic done
clear
D)
Simple tetragonal done
clear
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question_answer14)
The three dimensional graph of lattice points which sets the pattern for the whole lattice is called
A)
Space lattice done
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B)
Simple lattice done
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C)
Unit cell done
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D)
Crystal lattice done
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question_answer15)
Crystals can be classified into ...... basic crystal habits [MP PMT 1994]
A)
3 done
clear
B)
7 done
clear
C)
14 done
clear
D)
4 done
clear
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question_answer16)
How many molecules are there in the unit cell of sodium chloride [MP PMT 1996; MP PET 1997]
A)
2 done
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B)
4 done
clear
C)
6 done
clear
D)
8 done
clear
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question_answer17)
In a crystal, the atoms are located at the position of [AMU 1985]
A)
Maximum P.E. done
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B)
Minimum P.E. done
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C)
Zero P.E. done
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D)
Infinite P.E. done
clear
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question_answer18)
The total number of lattice arrangements in different crystal systems is [KCET (Engg.) 2001]
A)
3 done
clear
B)
7 done
clear
C)
8 done
clear
D)
14 done
clear
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question_answer19)
Monoclinic crystal has dimension [DCE 2000]
A)
\[a\ne b\ne c,\,\alpha =\gamma =90{}^\circ ,\,\beta \ne 90{}^\circ \] done
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B)
\[a=b=c,\,\alpha =\beta =\gamma =90{}^\circ \] done
clear
C)
\[a=b\ne c,\,\alpha =\beta =\gamma =90{}^\circ \] done
clear
D)
\[a\ne b\ne c,\,\alpha \ne \beta \ne \gamma \ne 90{}^\circ \] done
clear
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question_answer20)
The low solubility of \[BaS{{O}_{4}}\] in water can be attributed to [CBSE PMT 1991]
A)
High lattice energy done
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B)
Dissociation energy done
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C)
Low lattice energy done
clear
D)
Ionic bond done
clear
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question_answer21)
Bravais lattices are of [MP PMT 1997]
A)
8 types done
clear
B)
12 types done
clear
C)
14 types done
clear
D)
9 types done
clear
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question_answer22)
The structure of \[TlCl\] is similar to \[CsCl.\] What would be the radius ratio in \[TlCl\]
A)
\[0.155-0.225\] done
clear
B)
\[0.225-0.414\] done
clear
C)
\[0.414-0.732\] done
clear
D)
\[0.732-1.000\] done
clear
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question_answer23)
Structure similar to zinc blende is found in
A)
\[AgCl\] done
clear
B)
\[NaCl\] done
clear
C)
\[CuCl\] done
clear
D)
\[TlCl\] done
clear
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question_answer24)
The structure of \[N{{a}_{2}}O\] crystal is
A)
\[CsCl\] type done
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B)
\[NaCl\] type done
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C)
\[ZnS\] type done
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D)
Antifluorite done
clear
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question_answer25)
Structure of \[ZnS\] is
A)
Body centred cubic done
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B)
Face centred cubic done
clear
C)
Simple cube done
clear
D)
Fluorite structure done
clear
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question_answer26)
The crystal system of a compound with unit cell dimensions\[a=0.387\], \[b=0.387\] and \[c=0.504nm\] and \[\alpha =\beta ={{90}^{o}}\] and \[\gamma ={{120}^{o}}\] is [AIIMS 2004]
A)
Cubic done
clear
B)
Hexagonal done
clear
C)
Orthorhombic done
clear
D)
Rhombohedral done
clear
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question_answer27)
The number of tetrahedral voids in the unit cell of a face centered cubic lattice of similar atoms is [Kerala PMT 2004]
A)
4 done
clear
B)
6 done
clear
C)
8 done
clear
D)
10 done
clear
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question_answer28)
An \[fcc\] unit cell of aluminum contains the equivalent of how many atoms [DCE 2003]
A)
1 done
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B)
2 done
clear
C)
3 done
clear
D)
4 done
clear
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