InterviewSolution
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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
8:8 coordination of CsCl is found to change into 6:6 coordination :A. on increasing the pressureB. on increasing the temperatureC. on decreasing the pressureD. on decreasing the temperature |
| Answer» Correct Answer - B | |
| 2. |
In the crystal of CsCl ,the nearest neighbours of each Cs ion are :A. six chloride ionsB. eight Cs ionsC. six Cs ionsD. eight chloride ions |
| Answer» Correct Answer - D | |
| 3. |
Which of the following informations are correct about CsCl ?A. It has body centred cubic unit cell.B. Coordination number of both `Cs^(+)` and `Cl^(-)` ions aer eight.C. `Cl^(-)` ions are present at body centreD. `Cs^(+)` ions are present at body centre |
| Answer» Correct Answer - A::B::D | |
| 4. |
The co-ordination number of cations and anion in `CaF_(2)` and `CsCl` are respectively:A. `8:4 and 6:3`B. `6:3 and 4:4`C. `8:4 and 8:8`D. `4:2 and 2:4` |
| Answer» Correct Answer - C | |
| 5. |
Pure silicon doped with phosphorus is :A. amorphousB. p- type semiconductorC. n-type semiconductorD. insulator |
| Answer» Correct Answer - C | |
| 6. |
Statement -1:`CaCO_(3)` shows polymorphism. because Statement -2: `CaCO_(3)` exists in two forms called aragonite and calcite .A. Statement-1 is true, statement-2 is true, statement-2 is a correct explanation of statement-1.B. Statament-1 is true, statement-2 is true, statement-2 is not a correct explanation of statement-1C. Statement-1 is true, statement-2 is false.D. Statement-1 is false, statement-2 is true. |
| Answer» Correct Answer - A | |
| 7. |
At which temperature , is a ferrimagnetic solid converted to a ferromagnetic solid ?A. 850kB. 300 kC. 400 kD. 600 k |
| Answer» Correct Answer - A | |
| 8. |
Which of the following exists as covalent crystals in the solid state?A. sulphurB. phosphorusC. iodineD. silicon |
| Answer» Correct Answer - D | |
| 9. |
Packing refers to the arrangement of constituent units in such a way that the forces of attraction among the constituent particles is maximum and the constituents occupy the maximum available space. In two -dimensions ,there are square close packing and hexagonal close packing .In three- dimensions ,however, there are hexagonal close packing, cubic close packing and body-centered cubic packing. (i) hcp: AB AB AB AB ..... arrangement `" "`coordination no. = 12 `" "` % occupied space = 74 (ii) ccp: ABC ABC.... arrangement `" "` coordination no. = 12 `" "`% occupied space = 74 bcc: 68% space is occupied `" "`coordination no.= 8 The pattern of successive layers of ccp arrangement can be designated as:A. AB AB AB …..B. AB ABC AB ABC……..C. ABC ABC ABC ………D. AB AB AB AB……… |
| Answer» Correct Answer - C | |
| 10. |
Packing refers to the arrangement of constituent units in such a way that the forces of attraction among the constituent particles is maximum and the constituents occupy the maximum available space. In two -dimensions ,there are square close packing and hexagonal close packing .In three- dimensions ,however, there are hexagonal close packing, cubic close packing and body-centered cubic packing. (i) hcp: AB AB AB AB ..... arrangement `" "`coordination no. = 12 `" "` % occupied space = 74 (ii) ccp: ABC ABC.... arrangement lt brgt `" "` coordination no. = 12 `" "`% occupied space = 74 bcc: 68% space is occupied `" "`coordination no.= 8 The empty space laft in three -dimensions is :A. `26%`B. `74%`C. `52.4%`D. `80%` |
| Answer» Correct Answer - A | |
| 11. |
Which type of crystals contains only one Bravais lattice ?A. hexagonalB. triclinicC. rhombohedralD. monoclinic |
| Answer» Correct Answer - A::B::C | |
| 12. |
Which of the following compounds represents an inverse 2:3 spinel structure?A. `Fe^(III)[Fe^(II)Fe^(III)]O_(4)`B. `PbO_(2)`C. `Al_(2)O_(3)`D. `Mn_(3)O_(4)` |
| Answer» Correct Answer - A | |
| 13. |
The closeest-packing sequence ABAB….represents:A. primitive cubic packingB. body-centred cubic packingC. face-centred cubic packingD. hexagonal packing |
| Answer» Correct Answer - D | |
| 14. |
Which of the following compounds represents an inverse 2:3 spinel structure?A. `Mg^(II)Al_(2)^(III)O_(4)`B. `Co^(II)(Co^(III))_(2)O_(4)`C. `Zn(TiZn)O_(4)`D. `Ni(CO)_(4)` |
| Answer» Correct Answer - A::B | |
| 15. |
Crystalline solids have :A. sharp melting pointB. anisotropic characterC. the character of supercooled liquidD. smooth cooling curve |
| Answer» Correct Answer - A::B | |
| 16. |
In which of the following solids, cations occupy tetrahedral voids ?A. NaClB. CsBrC. ZnSD. `Na_(2)O` |
| Answer» Correct Answer - C::D | |
| 17. |
In the unit cell of NaCl, which of the following statements are correct ?A. `Na^(+)` ions have six `Cl^(-)` ions in its nearest neighbourhood.B. `Cl^(-)` ions have six `Na^(+)` ions in its nearest neighbourhood.C. Second nearest neighbour of `Na^(+)` ion are twelve `Na^(+)` ions.D. NaCl has 68% of occupied space. |
| Answer» Correct Answer - A::B::C | |
| 18. |
`B^(3+)` and `A^(2+)` ions are present in:A. tetrahedral voidsB. octahedral ,tetrahedral voids.C. tetrahedral ,octahedral voids.D. octahedral ,cubic voids. |
| Answer» Correct Answer - B | |
| 19. |
How many effective `NA^(+)` and `Cl^(-)` ions are present respectively in the rock salt(NaCl).if ions along the axis joining opposite faces is removed?A. `4,(7)/(2)`B. `(7)/(2),(7)/(2)`C. `(7)/(2),4`D. 3,3 |
| Answer» Correct Answer - D | |
| 20. |
In an ionic compound `XY_(2)O_(4)` oxide ions are arranged in ccp. Cations `X` are present in octahedral voids.Cations `Y` are equally distributed between octahedral voids occupied isA. `(1)/(4)`B. `(1)/(2)`C. `(1)/(6)`D. `(1)/(8)` |
| Answer» Correct Answer - B | |
| 21. |
`O_(2-)` ions are present in :A. bcc arrangementB. fcc arrangementC. hcp arrangementD. simple cubic arrangement |
| Answer» Correct Answer - B | |
| 22. |
The unit cell in a body centred cubic lattice is given in the figure. Each sphere has a radius ,r and the cube has a side ,a . What fraction of the total cube volume is empty ?A. `1-(8)/(3)pi(r^(3))/(a^(3))`B. `(4)/(3)*pi(r^(3))/(a^(3))`C. `(r)/(a)`D. `2-(4)/(3)pi(r^(3))/(a^(3))` |
| Answer» Correct Answer - D | |
| 23. |
First three nearest neighbour distance for body centred cubic lattice are respectively:A. `asqrt(2),a,asqrt(3)`B. `(a)/(sqrt(2)),a,asqrt(3)`C. `(asqrt(3))/(2),a,asqrt(2)`D. `(asqrt(3))/(2),a,asqrt(3)` |
| Answer» Correct Answer - C | |
| 24. |
The number of atoms per unit cell ina simple cubic ,face-centred cubic and body-centred cubic are . . .. .. .. Respectively :A. 1,4,2B. 4,1,2C. 2,3,1D. 4,8,2 |
| Answer» Correct Answer - A | |
| 25. |
Schottky defect in a crystal arises due toA. a pair of cation and anino vacanciesB. occupation of interstitial site by a pair of cation and anionC. occupation of intersitial sity by a cationD. occupation of interstitial site by an anion |
| Answer» Correct Answer - A | |
| 26. |
In a solid lattice the cation has left a lattice sirte and is located at an interstital position , the lattice defect isA. interstial defectB. vacancy defectC. frenkel defectD. Schottkydefect |
| Answer» Correct Answer - C | |
| 27. |
Statement -1:Distance between nearest neighbour in bcc is greater than that of fcc having same edge length. because Statenemt -2: fcc has greater packing than bcc.A. If both (A) and (R) are correct, and (R) is the correct explanation of (A).B. If both (A) and (R) are correct but (R) is not the correct explanation of (A).C. If (A) is correct but (R) is incorrect.D. If (A) is incorrect but (R) is correct. |
| Answer» Correct Answer - C | |
| 28. |
(A) Frenkel defect increases the dielectric constant of the solid. (R)In Frenkel defect like charged ions come closer.A. If both (A) and (R) are correct, and (R) is the correct explanation of (A).B. If both (A) and (R) are correct but (R) is not the correct explanation of (A).C. If (A) is correct but (R) is incorrect.D. If (A) is incorrect but (R) is correct. |
| Answer» Correct Answer - A | |
| 29. |
(A) KCL is more likely to show Schottky defect ,while Li is more likely to show Frenkel defect. (R) Schottly defect is found in those ionic solid which have cation and anion of similar size while Frenkel defect is more likely found in those solids which have cation of smaller size.A. If both (A) and (R) are correct, and (R) is the correct explanation of (A).B. If both (A) and (R) are correct but (R) is not the correct explanation of (A).C. If (A) is correct but (R) is incorrect.D. If (A) is incorrect but (R) is correct. |
| Answer» Correct Answer - A | |
| 30. |
Statement -1: Only anions occupy interstitial position in Frenkel defect . because Statement -2: Frenkel defect results into increase in the dielectric constant of the solid .A. Statement-1 is true, statement-2 is true, statement-2 is a correct explanation of statement-1.B. Statament-1 is true, statement-2 is true, statement-2 is not a correct explanation of statement-5C. Statement-1 is true, statement-2 is false.D. Statement-1 is false, statement-2 is true. |
| Answer» Correct Answer - D | |
| 31. |
For an ionic crystal of the formula `AX` and cooradition number `6`, the value of radius ratio will beA. greater than 0.73B. in between 0.73 and 0.41C. in between 0.41 and 0.22D. less than 0.22 |
| Answer» Correct Answer - B | |
| 32. |
Superconductors are technologically and commercially important substance. The correct information(s) about such conductors are :A. phenomena if syoerconductivity was first discovered by Kammerlingh and OnnesB. mercury acts as superconductorat 4kC. superconductors offer zero resistance and zero kelvinD. gallium acts as superconductor at 4k |
| Answer» Correct Answer - A::B::C | |
| 33. |
(A) Graphite is soft while diamond is hard. (R) Graphite has three dimensional structure while diamond has planar.A. If both (A) and (R) are correct, and (R) is the correct explanation of (A).B. If both (A) and (R) are correct but (R) is not the correct explanation of (A).C. If (A) is correct but (R) is incorrect.D. If (A) is incorrect but (R) is correct. |
| Answer» Correct Answer - C | |
| 34. |
What type of crystal defect is indicated in the diagram given below : `{:(Na^(+),Cl^(-),Na^(+),Cl^(-),Na^(+),Cl^(-)),(Cl^(-),square,Cl^(-),Na^(+),square,Cl^(-)),(Na^(+),Cl^(-),square,Cl^(-),Na^(+),Cl^(-)),(Cl^(-),Na^(+),Cl^(-),Na^(+),square,N^(+)):}`A. Frenkel defectB. SchottkydefectC. Interstial defectD. Frenkel and Schottkydefect |
| Answer» Correct Answer - B | |
| 35. |
If `NaCl` is doped with `10^(-4)mol%`of `SrCl_(2)` the concentration of cation vacancies will be `(N_(A)=6.02xx10^(23)mol^(-1))`A. `6.02xx10^(16) "mol"^(-1)`B. `6.02xx10^(17) "mol"^(-1)`C. `6.02xx10^(14) "mol"^(-1)`D. `6.02xx10^(15) "mol"^(-1)` |
| Answer» Correct Answer - B | |
| 36. |
Perovskite is a mineral with the formula `CaTiO_(3)` . Which of the positive ions in the crystal is more likely to be packed in the octahedral holes ?A. `Ti^(4+)`B. `Ti^(2+)`C. `Ca^(2+)`D. `O_(2)^(+)` |
| Answer» Correct Answer - A | |