Question

$A ^{+2}, B ^{+1}, C ^{-1}$ and $D ^{-2}$ are the stable ions formed by the elements ' $A ^{\prime}$, ' $B$ ', ' $C$ ' and ' $D$ '. Arrange A, B, C and D in the increasing order of their group numbers in the periodic table.

• A. ABDC
• B. BADC
• C. ABCD
• D. BACD

Answer 1

Answer: (B)

$A \rightarrow A^{+2}+2 e \Rightarrow 2^{\text {nd }} \text { group } $
$B \rightarrow B^{+1}+e \Rightarrow 1^{\text {st }} \text { group } $
$C+e \rightarrow C^{-1} \Rightarrow 17^{\text {th }} \text { group } $
$D+2 e \rightarrow O^{-2} \Rightarrow 16^{\text {th }} \text { group }$