Question:

The copper (II) halide which does not exist is

Updated On: Apr 4, 2024
  • $CuF_2$
  • $CuBr_2$
  • $CuI_2$
  • $CuCl_2$
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The Correct Option is C

Solution and Explanation

$CuI _{2}$ is not stable and thus does not exist iodide ion will act as reducing agent that converts $Cu(II)$ to $Cu(I)$ and part of iodide ion will be oxidised to iodine. The first reaction involved is as follows:

$2 Cu ^{2+}(a q)+4 I ^{-}(a q) \longrightarrow 2 \operatorname{CuI}(s)+ I _{2}(a q)$
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Concepts Used:

Group 17 Elements

Halogens are the group 17 elements of the periodic table. The term ‘halogen’ means ‘salt-producing’, hence the name halogens as they possess the tendency to form salts after reacting to metals. It generally has five elements:

  • Fluorine (F)
  • Chlorine (Cl)
  • Bromine (Br)
  • Iodine (I)
  • Astatine (At)

These are all naturally occurring halogens but Tennessine (Ts) is an artificially created halogen.

Halogens:

Halogens are highly reactive elements and are highly electronegative. They have a high tendency to react with metals to form salts. They are also known as Group 17 elements. They have 7 electrons in their outer shell with a configuration of (ns2 np5). Fluorine being the first halogen in group 17, is highly reactive. Astatine is a halogen because of its resemblance with iodine despite it being radioactive.

Electronic Configuration:

The general electronic configuration for group 17 elements is ns2np5. This configuration clearly shows that they have 7 electrons in their valence shell. They require one more electron to complete their octet and achieve noble gas configuration.