There is zero formal charges on nitrogen in NOCl and sulfur in SF6.
The Lewis structure of NOCl is shown in the image attached. The NOCl molecule is bent or angular. The N - O - Cl bond angle in the molecule is about 113°.The molecule is polar, the formal charge on nitrogen is calculated as follows;
FC = 5 - 2 - 6/2 = 0
The Lewis structure of SF6 is shown in the image attached. The molecule is octahedral hence the bond angle in the molecule is 90°. The molecule is nonpolar because it is symmetrical. The formal charge on sulfur atom is zero.
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