Q.

If NA is Avogadro's number then number of valence electrons in 4.2 g of nitride ions N3−

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a

2.4  NA

b

4.2  NA

c

1.6  NA

d

3.2  NA

answer is A.

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Detailed Solution

Valency shell electronic configuration of ‘N’ - 2S22p3 &  N-3 - 2S22P6 14  gm  N3−  ions  have 8NA  valence  electrons4.2  gm of N3−  ions  have =  8NA ×  4.214  =2.4 NA
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