The limiting radius ratio for tetrahedral shape is:

Question

The limiting radius ratio for tetrahedral shape is: (A) 0 to 0.155 (B) 0.225 to 0.414 (C) 0.155 to 0.225 (D) 0.414 to 0.732

Tardigrade Admin · Accepted Answer

The limiting radius ratios (of cation and anion) play a very important role in giving a due to the nature of crystal structure of the ionic substance.

S.No.	Limiting radius ratio $(r + / r -)$	Shape	Co-ordination number	Example
1.	Less than $0.225$	Linear	2 or 3	$B_{2} O_{3}$
2.	$0.225 - 0.414$	Tetrahedral	4	$C u Cl, C u B r, B a S, C u I$
3.	$0.414 - 0.732$	Square planer for 4 and octahedral for 8	4 or 6	$M g O, N a B r, M n O, K B r, A g Cl, N a Cl$
4.	$0.732$ more	Cube	8	$C s I, C s B r, N H_{4} B r$

Q. The limiting radius ratio for tetrahedral shape is:

0 to 0.155

0.225 to 0.414

0.155 to 0.225

0.414 to 0.732