Related InterviewSolutions

• 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
• 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
• 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
• 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`
• Pure silicon doped with phosphorus is :A. amorphousB. p- type semiconductorC. n-type semiconductorD. insulator
• 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.
• At which temperature , is a ferrimagnetic solid converted to a ferromagnetic solid ?A. 850kB. 300 kC. 400 kD. 600 k
• Which of the following exists as covalent crystals in the solid state?A. sulphurB. phosphorusC. iodineD. silicon
• 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………
• 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%`