SATHEE: Some Basic Concepts of Chemistry

Some Basic Concepts of Chemistry - Result Question 26

####25. If $N_{A}$ is Avogadro’s number then number of valence electrons in $4.2 g$ of nitride ions $(N^{3 -})$ is

(a) $2.4 N_{A}$

(b) $4.2 N_{A}$

(d) $3.2 N_{A}$

[1994]

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Solution:

(a) No of moles of nitride ion

$= \frac{4.2}{14} = 0.3 m o l = 0.3 \times N_{A}$ nitride ions.

Valence electrons $= 8 \times 0.3 N_{A} = 2.4 N_{A}$

Nitride ion has seven protons in the nucleus and ten electrons surrounding the nucleus. Therefore total no. of electrons is 10 . Number of valence electrons is $(5 + 3) = 8$ .

Some Basic Concepts of Chemistry - Result Question 26

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Some Basic Concepts of Chemistry - Result Question 26

Solution:

Engineering Preparation

Medical Preparation

NCERT Books & Solutions

Important Resources

Other Resources

Syllabus

Test Platform

Sample Mock Test

Mentorship

NCERT Exercise Video Solution

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