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151.	Magnesium and Titanium form a crystalline oxide in which Mg appears at the eight corners , oxygen appears at face centres and titanium appears at the centre of cube. The atomic mass of magnesium , titanium and oxygen is 24, 45.9 and 16 amu respectively. A similar compound is formed by calcium with titanium and oxygen . What type of crystalline structure does `MgTiO_3` have ?A. SpinelB. WurtziteC. AntifluoriteD. pervoskite
Answer» Correct Answer - D

152.	Assertion:Face centred cubic cell has 4 atoms per unit cell. Reason:In fcc unit cell , there are 8 atoms at the corners and 6 atoms at face centres .A. If both assertion and reason are true and reason is the correct explanation of assertionB. If both assertion and reason are true but reason is not the correct explanation of assertion.C. If assertion is true but reason is falseD. If both assertion and reason are false
Answer» Correct Answer - A

153.	An element A (Atomic weight =100 ) having b.c.c. structures has unit cell edge length 400 pm. Calculate the density of A. number of unit cells and number of atoms in 10 g of A.
Answer» `d="5.188 gm/cm"^3` No. of unit cells =`3.0155xx10^22` No of atoms =`6.023xx10^22` atoms of A

154.	in which of the following structures coordination number for cations and anions in the packed structure will be same ?A. `Cl^-` ions form fcc lattice and `Na^+` ions occupy all octahedral voids of the unit cell.B. `Ca^(2+)` ions form fcc lattice and `F^-` ions occupy all the eight tetrahedral voids of the unit cellC. `O^(2-)` ions form fcc lattice and `Na^(+)` ions occupy all the eight tetrahedral voids of the unit cellD. `S^(2-)` ions form fcc lattice and `Zn^(2+)` ions go into alternate tetrahedral voids of the unit cell
Answer» Correct Answer - A In NaCl type unit cell, all cations and anions have a coordination number of 6

155.	Which of the following structures is not correctly matched ?A. NaCl type - `Cl^-` ions in ccp structure. `Na^+` ions in half octahedral holesB. ZnS type - `S^(2-)` ions in ccp structure . `Zn^(2+)` ions in alternate tetrahedral voids .C. `CaF_2` type - `Ca^(2+)` ions in ccp structure `F^-` ions in all tetrahedral voidsD. `Na_2O` type - `O^(2-)` ions in ccp structure. `Na^(+)` ions in all tetrahedral holes .
Answer» Correct Answer - A In NaCl type, `Cl^-` ions form ccp structures while `Na^+` ions are present in all octahedral voids .

156.	All spinel structures do not haveA. CCP array of anionsB. Simple cubic structureC. BCC array of anionsD. HCP array of anions
Answer» Correct Answer - B::C::D

157.	Magnesium and Titanium form a crystalline oxide in which Mg appears at the eight corners , oxygen appears at face centres and titanium appears at the centre of cube. The atomic mass of magnesium , titanium and oxygen is 24, 45.9 and 16 amu respectively. A similar compound is formed by calcium with titanium and oxygen . What would be the formula of substance (oxide) ?A. `Mg_2TiO_3`B. `MgTiO_3`C. `MgTiO_4`D. `Mg_2TiO_4`
Answer» Correct Answer - B

158.	NaCl is a AB type of solid . Its crystalline structure is known as rock salt structure in which `r_"Na"^+` and `r_"Cl"^-` are 95 and 181 pm respectively , where `Cl^-` is present at the lattice point of face centered cubic unit cell `Na^+` ions are located in void and those compounds which have same crystalline structure also have same coordination system in which `Na^+` and `Cl^-` ions are surrounded by certain number of opposite ions respectively. Under high pressure coordination number changes to 8 :8 type from 6 :6 type. If the atomic mass of Li and Cl are 7 and 35.5 amu respectively , then what would be number of LiCl molecule in cubic of LiCl with length x height x breadth = 1 x 1 x 1=1 `cm^3` ?A. Nearly `2.5xx10^22`B. Nearly `4xx10^20`C. Nearly `12xx10^30`D. Nearly `14xx10^23`
Answer» Correct Answer - A

159.	NaCl is a AB type of solid . Its crystalline structure is known as rock salt structure in which `r_"Na"^+` and `r_"Cl"^-` are 95 and 181 pm respectively , where `Cl^-` is present at the lattice point of face centered cubic unit cell `Na^+` ions are located in void and those compounds which have same crystalline structure also have same coordination system in which `Na^+` and `Cl^-` ions are surrounded by certain number of opposite ions respectively. Under high pressure coordination number changes to 8 :8 type from 6 :6 type. LiCl adopts rock salt crystalline structure in which edge length is 5.40 Å. What would be the radii of `Li^+` ?A. 0.89 ÅB. 2.7 ÅC. 1.78 ÅD. 0.98 Å
Answer» Correct Answer - A

160.	NaCl is a AB type of solid . Its crystalline structure is known as rock salt structure in which `r_"Na"^+` and `r_"Cl"^-` are 95 and 181 pm respectively , where `Cl^-` is present at the lattice point of face centered cubic unit cell `Na^+` ions are located in void and those compounds which have same crystalline structure also have same coordination system in which `Na^+` and `Cl^-` ions are surrounded by certain number of opposite ions respectively. Under high pressure coordination number changes to 8 :8 type from 6 :6 type. On Subjecting NaCl under high pressure it changesA. From NaCl to CsClB. From NaCl and ZnSC. NaCl remains NaClD. It cause Shottky defect
Answer» Correct Answer - C

161.	NaCl is a AB type of solid . Its crystalline structure is known as rock salt structure in which `r_"Na"^+` and `r_"Cl"^-` are 95 and 181 pm respectively , where `Cl^-` is present at the lattice point of face centered cubic unit cell `Na^+` ions are located in void and those compounds which have same crystalline structure also have same coordination system in which `Na^+` and `Cl^-` ions are surrounded by certain number of opposite ions respectively. Under high pressure coordination number changes to 8 :8 type from 6 :6 type.What is the number of second nearest neighbours of `Na^+` in NaCl crystal ?A. 6B. 12C. 8D. 4
Answer» Correct Answer - B

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