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NaCl is a AB type of solid . Its crystal...

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 changes

A

From NaCl to CsCl

B

From NaCl and ZnS

C

NaCl remains NaCl

D

It cause Shottky defect

Text Solution

Verified by Experts

The correct Answer is:
C
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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 ?

The radii of Na^+ and Cl^- ions are 95 pm and 181 pm respectively. The edge length of NaCl unit cell is

The radii of Na+ and Cl^(-) ions are 100 pm and 200 pm respectively. Calculate the edge length of NaCl unit cell.