Question

Choose the correct statements:

• A. Fluorine is a super halogen
• B. Iodine shows Lewis basic character
• C. $AgF$ is insoluble in water
• D. $SC{N}^{-}$ is a pseudohalide

Answer 1

Answer: (A), (D)

The correct options are
A

Fluorine is a super halogen

D

$SC{N}^{-}$ is a pseudohalide

The only silver halide that is soluble in water is $AgF$. The others are part of a group of well-known precipitates often encountered in qualitative inorganic salt analysis. Fluorine is a super halogen as it is one of the most reactive elements. It is an extremely powerful oxidizing agent! Ions like azide, cyanide and $SC{N}^{-}$ are called pseudohalides because their chemistry is sometimes very similar to that of halides. $NC-CN$ - cyanogen is a pseudohalogen - much like the diatomic $Cl-Cl$ or $C{l}_2$ molecule.