Question

If $N_0$ represents Avogadro's number, the number of valence electrons in $4.2g$ of nitride ion $\left(N^{3-}\right)$ is

• A. $2.4N_0$
• B. $4.2N_0$
• C. $1.6N_0$
• D. $3.2N_0$

Answer 1

Answer: (A)

Number of valence electrons $=\frac{4.2}{14}\times N_0\times 8$
$[\because$ Number of valence electrons $=5+3=8]$
$=2.4N_0$