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Q)

If $N_A$ is Avogadro's number then number of valence electrons in $4.2\;g$ of nitride ions $(N^{3-})$ is

$(a)\;4.2\;N_A \\ (b)\;2.4\;N_A \\(c)\;1.6\;N_A \\(d)\;3.2\;N_A $

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