Question

Statement: An increase in radius ratio give rise to an increase in co-ordination number

State whether the given statement is true or false.

• A. True
• B. False

Answer 1

The correct option is A True

Limiting radius ratio $r/R$	Coordinate Number of cation	Structural Arrangement ( Geometry of voids)	Example
$0.155-0.225$	$3$	Plance Trigonal	Boron Oxide
$0.225-0.414$	$4$	Tetrahedral	$ZnS,Si{O}_2$
$0.414-0.732$	$4$	Square planar	-
$0.414-0.732$	$6$	Octahedral	$NaCl,Mg{O}_2$
$0.732-1.000$	$8$	Cubic	$CsCl$

Hence the statement is true.