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question_answer1)
Amorphous solids are
A)
Solid substance in real sense done
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B)
Liquid in real sense done
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C)
Supercooled liquid done
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D)
Substance with definite melting point done
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question_answer2)
Silicon is found in nature in the form of [MH CET 2002]
A)
Body centered cubic structure done
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B)
Hexagonal close-packed structure done
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C)
Network solid done
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D)
Face centered cubic structure done
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question_answer3)
A match box exhibits [MP PET 1993, 95]
A)
Cubic geometry done
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B)
Monoclinic geometry done
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C)
Orthorhombic geometry done
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D)
Tetragonal geometry done
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question_answer4)
Which has no rotation of symmetry [Orrisa JEE 2004]
A)
Hexagonal done
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B)
Orthorhombic done
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C)
Cubic done
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D)
Triclinic done
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question_answer5)
Which of the following molecules has three-fold axis of symmetry [UPSEAT 2004]
A)
\[N{{H}_{3}}\] done
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B)
\[{{C}_{2}}{{H}_{4}}\] done
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C)
\[C{{O}_{2}}\] done
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D)
\[S{{O}_{2}}\] done
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question_answer6)
Which one possess a antifluorite structure
A)
\[N{{a}_{2}}O\] done
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B)
\[MgO\] done
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C)
\[F{{e}_{2}}{{O}_{3}}\] done
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D)
\[A{{l}_{2}}{{O}_{3}}\] done
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question_answer7)
Which one of the following is the biggest ion [MP PET 1993]
A)
\[A{{l}^{+3}}\] done
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B)
\[B{{a}^{+2}}\] done
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C)
\[M{{g}^{+2}}\] done
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D)
\[N{{a}^{+}}\] done
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question_answer8)
The edge length of face centred unit cubic cell is \[508\,\,pm.\] If the radius of the cation is \[110\,\,pm,\] the radius of the anion is [CBSE PMT 1998]
A)
\[285\,\,pm\] done
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B)
\[398\,\,pm\] done
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C)
\[144\,\,pm\] done
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D)
\[618\,\,pm\] done
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question_answer9)
An element (atomic mass \[100g/mol)\] having \[bcc\] structure has unit cell edge \[400\,\,pm.\] Then density of the element is [CBSE PMT 1996; AIIMS 2002]
A)
\[10.376\,\,g/c{{m}^{3}}\] done
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B)
\[5.188\,\,g/c{{m}^{3}}\] done
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C)
\[7.289\,\,g/c{{m}^{3}}\] done
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D)
\[2.144\,\,g/c{{m}^{3}}\] done
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question_answer10)
If the pressure on a \[NaCl\] structure is increased, then its coordination number will [AFMC 2000]
A)
Increase done
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B)
Decrease done
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C)
Remain the same done
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D)
Either B or C done
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question_answer11)
The pyknometric density of sodium chloride crystal is \[2.165\times {{10}^{3}}kg\,{{m}^{-3}}\] while its X-rays density is \[2.178\times {{10}^{3}}kg\,{{m}^{-3}}\]. The fraction of unoccupied sites in sodium chloride crystal is [CBSE PMT 2003]
A)
\[5.96\times {{10}^{-3}}\] done
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B)
\[5.96\] done
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C)
\[5.96\times {{10}^{-2}}\] done
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D)
\[5.96\times {{10}^{-1}}\] done
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question_answer12)
Which of the following statements is correct for \[CsB{{r}_{3}}\] [IIT 1996]
A)
It is a covalent compound done
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B)
It contains \[C{{s}^{3+}}\] and \[B{{r}^{-}}\]ions done
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C)
It contains \[C{{s}^{+}}\] and \[Br_{3}^{-}\] ions done
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D)
It contains \[C{{s}^{+}},\,B{{r}^{-}}\]and lattice \[B{{r}_{2}}\] molecule done
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question_answer13)
In which compound 8 : 8 coordination is found [EAMCET 1984]
A)
\[CsCl\] done
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B)
\[MgO\] done
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C)
\[A{{l}_{2}}{{O}_{3}}\] done
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D)
All of these done
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question_answer14)
If the coordination of \[C{{a}^{2+}}\]in \[Ca{{F}_{2}}\] is 8, then the coordination number of \[{{F}^{-}}\] ion would be
A)
3 done
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B)
4 done
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C)
6 done
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D)
8 done
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question_answer15)
For some crystals, the radius ratio for cation and anion is 0.525, its coordination number will be
A)
2 done
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B)
4 done
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C)
6 done
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D)
8 done
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question_answer16)
The basic building unit of all silicates is [UPSEAT 2002]
A)
\[Si{{O}_{4}}\] square planar done
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B)
\[{{[Si{{O}_{4}}]}^{4-}}\] tetrahedron done
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C)
\[Si{{O}_{4}}\] octahedron done
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D)
\[Si{{O}_{4}}\] linear done
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question_answer17)
What type of crystal defect is indicated in the diagram below [AIEEE 2004] \[N{{a}^{+}}\,\,C{{l}^{-}}\,\,N{{a}^{+}}\,\,C{{l}^{-}}\,\,\,N{{a}^{+}}\,\,\,C{{l}^{-}}\] \[C{{l}^{-}}\] ¨ \[C{{l}^{-}}\] \[N{{a}^{+}}\] ¨ \[N{{a}^{+}}\] \[N{{a}^{+}}\] \[C{{l}^{-}}\]¨ \[C{{l}^{-}}\] \[N{{a}^{+}}\] \[C{{l}^{-}}\] \[C{{l}^{-}}\] \[N{{a}^{+}}\] \[C{{l}^{-}}\] \[N{{a}^{+}}\] ¨ \[N{{a}^{+}}\]
A)
Interstitial defect done
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B)
Schottky defect done
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C)
Frenkel defect done
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D)
Frenkel and Schottky defects done
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question_answer18)
Which of the following is a three dimensional silicate [MHCET 2003]
A)
Mica done
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B)
Spodumene done
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C)
Zeolite done
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D)
None of these done
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E)
12 done
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