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Question

The total number of valence electrons in 4.2 gm of N−3 ion are :

A
2.2 NA
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B
4.2 NA
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C
1.6 NA
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D
3.2 NA
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Solution

The correct option is C 1.6 NA
As each molecule of N3 has 16 valence electrons.

Therefore, one mole will have 16 mole of electrons.

Number of valence electrons = No. of moles ×NA× valence electrons.
Here, NA is the Avagadro number.

=4.242×NA×16

=1.6NA

Hence, option C is correct.

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