Question

If $N_{0}$ represents Avogadro's number, the number of valence electrons in $4.2 \,g$ of nitride ion $\left( N ^{3-}\right)$ is

• A. $2.4 \,N_{0}$
• B. $4.2\, N_{0}$
• C. $1.6 \,N_{0}$
• D. $3.2 \,N_{0}$

Answer 1

Answer: (A)

$2.4 \,N_{0}$

Answer 2

Number of valence electrons $=\frac{4.2}{14} \times N_{0} \times 8$ $[\because$ Number of valence electrons $=5+3=8]$ $=2.4 \,N_{0}$