Question

Which one of the following elements in its chloride does not show the valenceequal to its valence electrons?(a) NaCl (b) MgCl2 (c) AlCl3 (d) PCl3

Answer 1

Answer:

Explanation:

Nacl

Answer 2

Answer:

The correct Option for the given question is option (d)- $\mathrm{PCl}_{3}$

Explanation:

• Chlorine atomic number 17, the electronic configuration of the chlorine element is $1 \mathrm{s}^{2} 2 \mathrm{S}^{2} 2 \mathrm{P}^{6} 3 \mathrm{s}^{2} 3 \mathrm{p}^{5}$.

According to the electronic configuration, chlorine atom acquires only one electron to get stable octet electronic configuration.

Therefore, valence of chlorine atom is -1.

1. The given compound – NaCl

NaCl is dissociated into $\mathrm{Na}^{+}$ion and $\mathrm{Cl}^{-}$ions.In this compound chlorine has -1 charge,

    2. The given compound – $\mathrm{MgCl}_{2}.$

$\mathrm{MgCl}_{2}$ is dissociate into $\mathrm{Mg}^{2+}$and $\mathrm{Cl}^{-}$ ions. In this compound chlorine has -1 charge,

    3. The given compound –$\mathrm{AlCl}_{3}$

$\mathrm{AlCl}_{3}$ is dissociated into $\mathrm{A} 1^{3+}$and $\mathrm{Cl}^{-} ions$. In this compound chlorine has -1 charge.

    4. The$\mathrm{P} \mathrm{Cl}_{3}$ is a covalent compound it does not dissociated.