Question

PCl3 is called Phosphorus trichloride but AlCl3 is called aluminium chloride. explain?

Answer 1

Aluminum has a valency of 3 and forms a compound called Aluminum chloride with chlorine. It is stable.
But Phosphorous has a valency of 3 and 5. Hence it is called as phosphorous trichloride and Phosphorous penta chloride(PCl5)

Answer 2

$PCl_3$ is called Phosphorus trichloride but $AlCl_3$ is called aluminium chloride.

Explanation:

• When elements such as phosphorus and aluminium combine with chlorine respective chlorides are formed.
• Aluminium forms only one type of chloride which is called aluminium chloride as per the following chemical reaction:

$2Al+3Cl_2\rightarrow 2AlCl_3$

• On contrary, phosphorous forms two different types of chlorides namely phosphorous trichloride and phosphorous pentachloride.

$2P+3Cl_2\rightarrow 2PCl_3$

$2P+5Cl_2\rightarrow 2PCl_5$

• Due to formation of two different chloride by phosphorous, $PCl_3$ is called Phosphorus trichloride, whereas aluminium forms only $AlCl_3$ it is called as aluminium chloride.

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