Question

Which is true for an element R present in III A group of the periodic table?

• A. It forms halide of type $R{X}_3$
• B. It has oxidation state of +3
• C. It forms oxide of type $R_2{O}_3$
• D. .All the above

Answer 1

Answer: (D)

.All the above

Given $R$ is an element in the $3A$ group of the periodic table,so it has a maximum oxidation state of $+3$

$A)$As halide is monovalent the element $R$ forms halides of the form $R{X}_3$

$B)$ it has an oxidation state of $+3$,so this option is true.

$C)$As oxygen is divalent The element $R$ forms oxides of the type $R_2{O}_3$

So,all the above options are true.