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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.
What is the number of second nearest neighbours of `Na^+` in NaCl crystal ?
a. 6
b. 12
c. 8
d. 4

A

6

B

12

C

8

D

4

Text Solution

Verified by Experts

The correct Answer is:
B
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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. On Subjecting NaCl under high pressure it changes

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. In rock salt type structure of AB solid , what would be the maximum radius of 'X' that can displace A^+ if radius of B^- is 100 pm ?

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^+ ?

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