Question

Transition elements form binary compounds with halogens. Which of the following elements will form $M{F}_3$ type compounds?

• A. $Cr$
• B. $Cu$
• C. $Ni$
• D. All of these

Answer 1

The correct option is A $Cr$

$Cu\to {Cu}^{+},{Cu}^{2+}\to CuCl,{CuF}_2$

generally transition metals form binary compounds with halogens but $Cr$ form ${CrF}_3$

$\Rightarrow {MF}_3$ type compound