Which of the following does/do not follow the IUPAC naming convention and/or spelled wrongly?

(A) Bis(ethylenediamine)sulfatoiron(II)
(B) Sodium hexanitritocobaltate(III)
(C) Pentaammineazidocobalt(III) sulfate
(D) A, B and C do not have any problems in their naming
(E) A and C have problems in their naming

To determine which of the options do not follow the IUPAC naming convention and/or are spelled incorrectly, we need to analyze each option separately.

(A) Bis(ethylenediamine)sulfatoiron(II):
This compound follows the IUPAC naming convention and appears to be spelled correctly.

(B) Sodium hexanitritocobaltate(III):
This compound also follows the IUPAC naming convention. However, we need to check the spelling. The correct spelling should be "hexanitritocobaltate" instead of "hexanitritocobaltite." Therefore, option (B) has a spelling error.

(C) Pentaammineazidocobalt(III) sulfate:
This compound follows the IUPAC naming convention, but we need to check if it is spelled correctly. The correct spelling is "pentaammineazidocobalt" instead of "pentaammineazidocobalt." Therefore, option (C) has a spelling error.

From our analysis, we can see that options (B) and (C) have problems in their naming, either in terms of spelling or adherence to the IUPAC convention. Thus, the correct answer is (E) - A and C have problems in their naming.