MCQOPTIONS
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MCQOPTIONS
This section includes 42 Mcqs, each offering curated multiple-choice questions to sharpen your Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Which of the following conditions favours the existence of a substance in the solid state? |
| A. | High temperature |
| B. | Low temperature |
| C. | High thermal energy |
| D. | Weak cohesive forces |
| Answer» C. High thermal energy | |
| 2. |
p-type semiconductors are formed When Si or Ge are doped with |
| A. | group 14 elements |
| B. | group 15 elements |
| C. | group 13 elements |
| D. | group 18 elements |
| Answer» D. group 18 elements | |
| 3. |
To get n-type of semiconductor, germanium should be doped with |
| A. | gallium |
| B. | arsenic |
| C. | aluminium |
| D. | boron |
| Answer» C. aluminium | |
| 4. |
In a Schottky defect |
| A. | an ion moves to interstitial position between the lattice points |
| B. | electrons are trapped in a lattice site |
| C. | some lattice sites are vacant |
| D. | some extra cations are present in interstitial space |
| Answer» D. some extra cations are present in interstitial space | |
| 5. |
What is the effect of Frenkel defect on the density of ionic solids? |
| A. | The density of the crystal increases |
| B. | The density of the crystal decreases |
| C. | The density of the crystal remains unchanged |
| D. | There is no relationship between density of a crystal and defect present in it |
| Answer» D. There is no relationship between density of a crystal and defect present in it | |
| 6. |
In which pair most efficient packing is present? |
| A. | hep and bcc |
| B. | hep and ccp |
| C. | bcc and ccp |
| D. | bcc and simple cubic cell |
| Answer» C. bcc and ccp | |
| 7. |
Which of the following will have metal deficiency defect? |
| A. | NaCl |
| B. | FeO |
| C. | KCl |
| D. | ZnO |
| Answer» C. KCl | |
| 8. |
What type of stoichiometric defect is shown by ZnS? |
| A. | Schottky defect |
| B. | Frenkel defect |
| C. | Both Frenkel and Schottky defects |
| D. | Non-stoichiometric defect |
| Answer» C. Both Frenkel and Schottky defects | |
| 9. |
Silver halides generally show |
| A. | Schottky defect |
| B. | Frenkel defect |
| C. | Both Frenkel and Schottky defects |
| D. | cation excess defect |
| Answer» D. cation excess defect | |
| 10. |
Which of the following crystals does not exhibit Frenkel defect? |
| A. | AgBr |
| B. | AgCl |
| C. | KBr |
| D. | ZnS |
| Answer» D. ZnS | |
| 11. |
The coordination number of Y will be in the XY types of crystal: |
| A. | 6 |
| B. | 8 |
| C. | 12 |
| D. | 4 |
| Answer» B. 8 | |
| 12. |
Edge length of unit cell of chromium metal is 287 pm with bcc arrangement. The atomic radius is of the order |
| A. | 287 pm |
| B. | 574 pm |
| C. | 124.27 pm |
| D. | 143.5 pm |
| Answer» D. 143.5 pm | |
| 13. |
The edge length of fee cell is 508 pm. If radius of cation is 110 pm, the radius of anion is |
| A. | 110 pm |
| B. | 220 pm |
| C. | 285 pm |
| D. | 144 pm |
| Answer» E. | |
| 14. |
In Zinc blende structure |
| A. | zinc ions occupy half of the tetrahedral sites |
| B. | each Zn2- ion is surrounded by six sulphide ions |
| C. | each S2- ion is surrounded by six Zn2+ ions |
| D. | it has fee structure |
| Answer» D. it has fee structure | |
| 15. |
Alkali halids do not show Frenkel defect because |
| A. | cations and anions have almost equal size |
| B. | there is a large difference in size of cations and anions |
| C. | cations and anions have low coordination number |
| D. | anions cannot be accommodated in voids |
| Answer» B. there is a large difference in size of cations and anions | |
| 16. |
How many chloride ions are surrounding sodium ion in sodium chloride crystal ? |
| A. | 4 |
| B. | 8 |
| C. | 6 |
| D. | 12 |
| Answer» D. 12 | |
| 17. |
In NaCl structure |
| A. | all octahedral and tetrahedral sites are occupied |
| B. | only octahedral sites are occupied |
| C. | only tetrahedral sites are occupied |
| D. | neither octahedral nor tetrahedral sites are occupied |
| Answer» C. only tetrahedral sites are occupied | |
| 18. |
NaCl typecrystal (with coordination no. 6 : 6) can be converted into CsCl type crystal (with coordination no. 8 : 8) by applying |
| A. | high temperature |
| B. | high pressure |
| C. | high temperature and high pressure |
| D. | low temperature and low pressure |
| Answer» C. high temperature and high pressure | |
| 19. |
Which one of the following is non-crystalline or amorphous? |
| A. | Diamond |
| B. | Graphite |
| C. | Glass |
| D. | Common Salt |
| Answer» D. Common Salt | |
| 20. |
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. | \[5.96\times {{10}^{-3}}\] |
| B. | \[5.96\] |
| C. | \[5.96\times {{10}^{-2}}\] |
| D. | \[5.96\times {{10}^{-1}}\] |
| Answer» B. \[5.96\] | |
| 21. |
Schottky defect generally appears in [DCE 2004] |
| A. | \[NaCl\] |
| B. | \[KCl\] |
| C. | \[CsCl\] |
| D. | All of these |
| Answer» E. | |
| 22. |
Doping of silicon (Si) with boron B leads to [UPSEAT2004] |
| A. | \[n\]-type semiconductor |
| B. | \[p\]-type semiconductor |
| C. | Metal |
| D. | Insulator |
| Answer» E. | |
| 23. |
The flame colours of metal ions are due to [KCET 2003] |
| A. | Frenkel defect |
| B. | Schottky defect |
| C. | Metal deficiency defect |
| D. | Metal excess defect |
| Answer» E. | |
| 24. |
Point defects are present in[MP PMT 1997] |
| A. | Ionic solids |
| B. | Molecular solids |
| C. | Amorphous solids |
| D. | Liquids |
| Answer» B. Molecular solids | |
| 25. |
How many space lattices are obtainable from the different crystal systems [MP PMT 1996; MP PET/PMT 1998] |
| A. | 7 |
| B. | 14 |
| C. | 32 |
| D. | 230 |
| Answer» C. 32 | |
| 26. |
Which of the following is correct [DPMT 1997] |
| A. | Crystal systemAxial distanceAxial anglesExamplesCubic\[a\ne ~b=c\]\[\alpha =\beta \ne \gamma =90{}^\circ \]\[Cu,\text{ }KCl\] |
| B. | Crystal systemAxial distanceAxial anglesExamplesMonoclinic\[a\ne ~b=c\]\[\alpha =\beta =\gamma =90{}^\circ \]\[PbCr{{O}_{2}},PbCr{{O}_{4}}\] |
| C. | Crystal systemAxial distanceAxial anglesExamplesRhombohedral\[a=~b=c\]\[\alpha =\beta =\gamma \ne 90{}^\circ \]\[CaC{{O}_{3}},\text{ }HgS\] |
| D. | Crystal systemAxial distanceAxial anglesExamplesTriclinic\[a=~b=c\]\[\alpha \ne \beta =\gamma \ne 90{}^\circ \]\[{{K}_{2}}C{{r}_{2}}{{O}_{7}},\text{ }CuS{{O}_{4}}.\text{ }5{{H}_{2}}O\] |
| Answer» D. Crystal systemAxial distanceAxial anglesExamplesTriclinic\[a=~b=c\]\[\alpha \ne \beta =\gamma \ne 90{}^\circ \]\[{{K}_{2}}C{{r}_{2}}{{O}_{7}},\text{ }CuS{{O}_{4}}.\text{ }5{{H}_{2}}O\] | |
| 27. |
Coordination number for \[Cu\] is[AMU 1982] |
| A. | 1 |
| B. | 6 |
| C. | 8 |
| D. | 12 |
| Answer» E. | |
| 28. |
In the calcium fluoride structure the co-ordination number of the cation and anions are respectively [J & K2005] |
| A. | 6, 6 |
| B. | 8, 4 |
| C. | 4, 4 |
| D. | 4, 8 |
| Answer» C. 4, 4 | |
| 29. |
If the radius ratio is in the range of \[0.414-0.732,\] then the coordination number will be |
| A. | 2 |
| B. | 4 |
| C. | 6 |
| D. | 8 |
| Answer» D. 8 | |
| 30. |
Most crystals show good cleavage because their atoms, ions or molecules are [CBSE PMT 1991] |
| A. | Weakly bonded together |
| B. | Strongly bonded together |
| C. | Spherically symmetrical |
| D. | Arranged in planes |
| Answer» E. | |
| 31. |
If the number of atoms per unit in a crystal is 2, the structure of crystal is |
| A. | Octahedral |
| B. | Body centred cubic bcc |
| C. | Face centred cubic fcc |
| D. | simple cubic |
| Answer» C. Face centred cubic fcc | |
| 32. |
The number of octahedral voids in a unit cell of a cubical closest packed structure is |
| A. | 1 |
| B. | 2 |
| C. | 4 |
| D. | 8 |
| Answer» D. 8 | |
| 33. |
Which one of the following is the biggest ion [MP PET 1993] |
| A. | \[A{{l}^{+3}}\] |
| B. | \[B{{a}^{+2}}\] |
| C. | \[M{{g}^{+2}}\] |
| D. | \[N{{a}^{+}}\] |
| Answer» C. \[M{{g}^{+2}}\] | |
| 34. |
Which one possess a antifluorite structure |
| A. | \[N{{a}_{2}}O\] |
| B. | \[MgO\] |
| C. | \[F{{e}_{2}}{{O}_{3}}\] |
| D. | \[A{{l}_{2}}{{O}_{3}}\] |
| Answer» B. \[MgO\] | |
| 35. |
Which of the following molecules has three-fold axis of symmetry [UPSEAT 2004] |
| A. | \[N{{H}_{3}}\] |
| B. | \[{{C}_{2}}{{H}_{4}}\] |
| C. | \[C{{O}_{2}}\] |
| D. | \[S{{O}_{2}}\] |
| Answer» B. \[{{C}_{2}}{{H}_{4}}\] | |
| 36. |
Which of the following is a three dimensional silicate [MHCET 2003] |
| A. | Mica |
| B. | Spodumene |
| C. | Zeolite |
| D. | None of these |
| E. | 12 |
| Answer» D. None of these | |
| 37. |
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 |
| B. | Schottky defect |
| C. | Frenkel defect |
| D. | Frenkel and Schottky defects |
| Answer» C. Frenkel defect | |
| 38. |
The basic building unit of all silicates is [UPSEAT 2002] |
| A. | \[Si{{O}_{4}}\] square planar |
| B. | \[{{[Si{{O}_{4}}]}^{4-}}\] tetrahedron |
| C. | \[Si{{O}_{4}}\] octahedron |
| D. | \[Si{{O}_{4}}\] linear |
| Answer» C. \[Si{{O}_{4}}\] octahedron | |
| 39. |
In which compound 8 : 8 coordination is found [EAMCET 1984] |
| A. | \[CsCl\] |
| B. | \[MgO\] |
| C. | \[A{{l}_{2}}{{O}_{3}}\] |
| D. | All of these |
| Answer» B. \[MgO\] | |
| 40. |
Which of the following statements is correct for \[CsB{{r}_{3}}\] [IIT 1996] |
| A. | It is a covalent compound |
| B. | It contains \[C{{s}^{3+}}\] and \[B{{r}^{-}}\]ions |
| C. | It contains \[C{{s}^{+}}\] and \[Br_{3}^{-}\] ions |
| D. | It contains \[C{{s}^{+}},\,B{{r}^{-}}\]and lattice \[B{{r}_{2}}\] molecule |
| Answer» D. It contains \[C{{s}^{+}},\,B{{r}^{-}}\]and lattice \[B{{r}_{2}}\] molecule | |
| 41. |
Silicon is found in nature in the form of [MH CET 2002] |
| A. | Body centered cubic structure |
| B. | Hexagonal close-packed structure |
| C. | Network solid |
| D. | Face centered cubic structure |
| Answer» D. Face centered cubic structure | |
| 42. |
Amorphous solids are |
| A. | Solid substance in real sense |
| B. | Liquid in real sense |
| C. | Supercooled liquid |
| D. | Substance with definite melting point |
| Answer» D. Substance with definite melting point | |