Which of these names and formulae do not match correctly

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Which of these names and formulae do NOT match correctly?
1. Fe(NO3)3 : iron (III) nitrate
2. N2O4 : dinitrogen tetroxide
3. HgCl : mercury (II) chloride
4. SF6 : sulfur hexafluoride
5. MgF2 : magnesium fluoride

Reference no: EM13172862

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