Question

The atomic numbers of elements $A,B,C$ and $D$ are $Z-1,Z,Z+1$ and $Z+2$, respectively. If ${}^{\prime }{B}^{\prime }$ is a noble gas, choose the correct answers from the following statements
(1) ${}^{\prime }{A}^{\prime }$ has higher electron affinity
(2) ${}^{\prime }{C}^{\prime }$ exists in $+2$ oxidation state
(3) ${}^{\prime }{D}^{\prime }$ is an alkaline earth metal

• A. (1) and (2)
• B. (2) and (3)
• C. (1) and (3)
• D. (1), (2) and (3)

Answer 1

Answer: (C)

(1) and (3)

B is a noble gas so the next element will be in the next period and will be alkali metals. Next element will be than alkaline earth metal.
(1) ′A′ has higher electron affinity. It belongs to halogen family.
(2) ′C′ exists in +1 oxidation state
(3) ′D′ is an alkaline earth metal
Hence, the statements (1) and (3) are correct.