$KF$ combines with $HF$ to form $KHF_2$. The compound contains the species:
- $K^+, F^+$ and $H^+$
- $K^+, F^-$ and $HF$
- $K^+$ and $[HF_2]^-$
- $[KHF]^+$ and $F_2$
The Correct Option is C
Solution and Explanation
$KF + HF \rightarrow KHF _{2}$
It is formed due to $H$-bond. $K ^{+} F ^{-}---- H - F$ (-- is $H$-bond)
So, the compound contains $K ^{+}$and $\left[ HF _{2}\right]^{-}$ions.
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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.
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