Question

What is the physical state of $PC{l_3}$ under normal conditions?
A.Solid
B.Liquid
C.Gaseous
D.None of the above

Answer 1

$PC{l_3}$ or phosphorus trichloride is a yellow coloured covalent compound since we know that the covalent bonds are the weak forces or the attractions, so at the normal conditions, $PC{l_3}$ will not reside in the solid-state, this means that $PC{l_3}$ has to be either gas or liquid at the normal conditions.

Complete answer:
As from the above discussion we now have a basic idea regarding the forces operating in the $PC{l_3}$ molecule. Since $PC{l_3}$ is composed of the central Phosphorus molecule surrounded by the three chlorine molecules. All these four atoms are completing their octet by sharing electrons with each other.
Since, we know that the bonds operating between the $PC{l_3}$ molecule is covalent bonds and these covalent bonds are the weak force of attraction, so at the normal conditions, the $PC{l_3}$ molecule is liquid.
So, we now know the answer that the physical state of $PC{l_3}$ under normal conditions is Liquid.

Therefore, on the basis of our above discussion, we can say that the correct answer is option C. i.e. liquid state

Note:
In the best terms, $PC{l_3}$ can be defined as the colorless or the light- a yellow liquid with a very strong pungent smell. Generally, it smells like a strong hydrochloric acid, and a fuming liquid, with a colorless to light yellow color. The $PC{l_3}$ gas is a very toxic chemical on inhalation, also it causes skin burns and irritation as it easily gets absorbed on the skin.