Final answer:The total number of lone pairs in NCl3 is 10: one lone pair on the nitrogen atom and three lone pairs on each of the three chlorine atoms.Explanation:The total number of lone pairs in NCl3 (nitrogen trichloride) can be calculated by examining the electron configuration of nitrogen (N) and chlorine (Cl) atoms. Nitrogen, being in group 5A of the periodic table, has five valence electrons, and chlorine, in group 7A, has seven valence electrons.In NCl3, the nitrogen atom forms three single bonds with three chlorine atoms, and has one lone pair of electrons left. Each chlorine atom forms one single bond with nitrogen and has three lone pairs.So, there is one lone pair on nitrogen, and three lone pairs on each of the three chlorine atoms, which gives us a total number of:1 (on N) + 3 * 3 (on each Cl) = 1 + 9 = 10 lone pairs.Hence, the correct answer is:D. 10....

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