Question

In the following question a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below.

Assertion (A): Sodium chloride formed by the action of chlorine gas on sodium metal is a stable compound.

Reason (R): This is because sodium and chloride ions acquire octet in sodium chloride formation.

• A. A and R both are correct, and R is the correct explanation of A.
• B. A is true but R is false.
• C. A and R both are correct, and R is the correct explanation of A.
• D. A and R both are false

Answer 1

The correct option is C

A and R both are correct, and R is the correct explanation of A.

Analyzing the assertion

Sodium chloride formed by the action of chlorine gas on sodium metal is a stable compound.

It’s a correct statement because of the following reason.

Analyzing the reason

As in $NaCl$ (Sodium Chloride / Common salt), sodium is present as Na+ ion and chlorine is present as $C{l}^{-}$ ion.

Electronic configurations of ions are:

$N{a}^{+}=\left[He\right]2s^{2}2p^6$
$C{l}^{-}=\left[Ne\right]3s^{2}3p^6$

Here both ions have complete octets i.e., both are stable hence $Nacl$ is also stable.

Thus, assertion and reason both are correct, and reason is the correct explanation of assertion.

So, the correct answer is option (A).